GUI hands when applying Merge modules via ILMerge

When I select Pre-Processing > Merge modules via ILMerge and click Apply the GUI hangs infinitely (this is, I waited few minutes).

![dllexport_hang](https://user-images.githubusercontent.com/38111589/92309634-80574000-efa7-11ea-9a2e-f3923ed850ff.gif)

* `DllExport -version`: 1.7.3+9a4bc51
* Used Visual Studio: 16.7.2

Information from `Data` tab or log data: 

<details> <p>

```Installed: True; 1.7.3+9a4bc51; invoked: 1.7.3
Project type: Cs
Storage: ProjectFiles
Compiler.Platform: Auto
Compiler.ordinalsBase: 1
Compiler.rSysObj: False
Compiler.ourILAsm: False
Compiler.customILAsm: 
Compiler.genExpLib: False
Compiler.peCheck: 3
Compiler.patches: None
PreProc.Type: None
PreProc.Cmd: 
PostProc.Type: None
PostProc.ProcEnv: $(SolutionPath);$(MSBuildThisFileFullPath)
PostProc.Cmd: 
SignAssembly: 
Identifier: F3E3613C-3055-4F3B-ABBF-4420E14FEC23
Instance: C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Current\Bin\amd64\MSBuild.exe
Project path: F:\VSProjcets\PlSqlDeveloperPluginNet\IfsIntegrationPLugin\IfsIntegrationPlugin.csproj
Action: Configure
PlatformTarget: AnyCPU
TargetFramework: 
TargetFrameworks: 
TargetFrameworkVersion: v4.7.2
RootNamespace: IfsIntegrationPLugin
AssemblyName: IfsIntegrationPlugin
MgrArgs: 
MetaLib: tools\raw\lib\net20\DllExport.dll
MetaCor: tools\raw\lib\netstd\DllExport.dll
Proxy: 
StoragePath: .net.dllexport.targets
ddNS: RGiesecke.DllExport
ddNS max buffer: 500
UseCecil: True
intermediateFiles: False
timeout: 30000
RootPath: F:\VSProjcets\PlSqlDeveloperPluginNet\
PkgPath: F:\VSProjcets\PlSqlDeveloperPluginNet\packages\\DllExport.1.7.3\
SlnFile: 
SlnDir: F:\VSProjcets\PlSqlDeveloperPluginNet\.\
DxpTarget: tools\net.r_eg.DllExport.targets
MsgGuiLevel: -1
LockIfError: 
```

</p></details>

stdout after hitting Apply:

<details>

```[18:42:56.2000] [Info] Trying to remove Wz PackageReference records
[18:42:56.2150] [Info] Remove old Import elements:'net.r_eg.DllExport.targets'
[18:42:56.2180] [Info] Trying to remove old Import elements via pk:'8337224c9ad9e356'
[18:42:56.2200] [Info] Trying to remove old restore-target: 'DllExportRestorePkg'
[18:42:56.2231] [Info] Trying to remove dynamic `import` section: 'DllExportRPkgDynamicImport'
[18:42:56.2231] [Info] Trying to remove X_EXT_STORAGE Import elements: '545F5C4B-1B08-4609-AFCC-B4B670B2A8DD'
[18:42:56.2251] [Info] Find and remove 'net.r_eg.DllExport.targets' as an old .target file of the DllExport.
[18:42:56.2270] [Debug] Trying to remove pre-proc-targets: `DllExportPreProc`, `DllExportPreProcAfter`
[18:42:56.2311] [Debug] Trying to remove post-proc-target `DllExportPostProc`
[18:42:56.6461] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportIdent':'E8FBEC0B-804D-4864-9CB7-147AA5562AE3'
[18:42:57.1860] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportMetaLibName':'DllExport.dll'
[18:42:57.1890] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportNamespace':'RGiesecke.DllExport'
[18:42:57.1900] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportDDNSCecil':'true'
[18:42:57.1920] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportSkipOnAnyCpu':'false'
[18:42:57.2250] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'PlatformTarget':'AnyCPU'
[18:42:57.2270] [Debug] Export has been configured for platform: x86 + x64
[18:42:57.2330] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportOrdinalsBase':'1'
[18:42:57.2341] [Debug] The Base for ordinals: 1
[18:42:57.2341] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportGenExpLib':'false'
[18:42:57.2360] [Debug] Generate .exp + .lib via MS Library Manager: False
[18:42:57.2390] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportOurILAsm':'false'
[18:42:57.2401] [Debug] Use our IL Assembler: False
[18:42:57.2410] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportSysObjRebase':'false'
[18:42:57.2420] [Debug] Rebase System Object: False
[18:42:57.2451] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportLeaveIntermediateFiles':'false'
[18:42:57.2461] [Debug] Flag to keep intermediate Files (IL Code, Resources, ...): False
[18:42:57.2471] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportTimeout':'30000'
[18:42:57.2481] [Debug] Timeout of execution in milliseconds: 30000
[18:42:57.2481] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportPeCheck':'2'
[18:42:57.2490] [Debug] Type of checking PE32/PE32+ module: PeIl
[18:42:57.2511] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportPatches':'0'
[18:42:57.2520] [Debug] Applied Patches: None
[18:42:57.2571] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportPreProcType':'0'
[18:42:57.2581] [Debug] Pre-Processing type: None
[18:42:57.2621] [Debug] 'TestPSDPlugin\TestPSDPlugin.csproj' Schedule an adding property: 'DllExportPostProcType':'0'
[18:42:57.2631] [Debug] Post-Processing type: None
[18:42:57.3000] [Info] Add .targets: '$(SolutionDir)packages\DllExport.1.7.3\tools\net.r_eg.DllExport.targets':8337224c9ad9e356
[18:42:57.3171] [Info] Add 'DllExportRestorePkg' target
[18:42:57.3311] [Info] Add meta library: 'F:\VSProjcets\PlSqlDeveloperPluginNet\packages\DllExport.1.7.3\gcache\$(DllExportMetaXBase)\$(DllExportNamespace)\$(DllExportMetaLibName)'
[18:42:57.3330] [Info] Add 'DllExportRPkgDynamicImport' target
[18:42:57.3720] [Info] Trying to remove Wz PackageReference records
[18:42:57.3731] [Info] Remove old Import elements:'net.r_eg.DllExport.targets'
[18:42:57.3741] [Info] Trying to remove old Import elements via pk:'8337224c9ad9e356'
[18:42:57.3750] [Info] Trying to remove old restore-target: 'DllExportRestorePkg'
[18:42:57.3761] [Info] Trying to remove dynamic `import` section: 'DllExportRPkgDynamicImport'
[18:42:57.3770] [Info] Trying to remove X_EXT_STORAGE Import elements: '545F5C4B-1B08-4609-AFCC-B4B670B2A8DD'
[18:42:57.3780] [Info] Find and remove 'net.r_eg.DllExport.targets' as an old .target file of the DllExport.
[18:42:57.3791] [Debug] Trying to remove pre-proc-targets: `DllExportPreProc`, `DllExportPreProcAfter`
[18:42:57.3800] [Debug] Trying to remove post-proc-target `DllExportPostProc`
[18:42:57.7420] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportIdent':'04B9F5EA-B14B-427C-9C33-DEEB3A81DF91'
[18:42:57.7700] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportMetaLibName':'DllExport.dll'
[18:42:57.7721] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportNamespace':'RGiesecke.DllExport'
[18:42:57.7731] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportDDNSCecil':'true'
[18:42:57.7741] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportSkipOnAnyCpu':'false'
[18:42:57.7970] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'PlatformTarget':'AnyCPU'
[18:42:57.8010] [Debug] Export has been configured for platform: x86 + x64
[18:42:57.8021] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportOrdinalsBase':'1'
[18:42:57.8031] [Debug] The Base for ordinals: 1
[18:42:57.8040] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportGenExpLib':'false'
[18:42:57.8051] [Debug] Generate .exp + .lib via MS Library Manager: False
[18:42:57.8061] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportOurILAsm':'false'
[18:42:57.8070] [Debug] Use our IL Assembler: False
[18:42:57.8081] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportSysObjRebase':'false'
[18:42:57.8090] [Debug] Rebase System Object: False
[18:42:57.8111] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportLeaveIntermediateFiles':'false'
[18:42:57.8121] [Debug] Flag to keep intermediate Files (IL Code, Resources, ...): False
[18:42:57.8131] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportTimeout':'30000'
[18:42:57.8140] [Debug] Timeout of execution in milliseconds: 30000
[18:42:57.8140] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportPeCheck':'2'
[18:42:57.8161] [Debug] Type of checking PE32/PE32+ module: PeIl
[18:42:57.8171] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportPatches':'0'
[18:42:57.8181] [Debug] Applied Patches: None
[18:42:57.8191] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportPreProcType':'0'
[18:42:57.8210] [Debug] Pre-Processing type: None
[18:42:57.8210] [Debug] 'PreserveWorkspacePlugin\PreserveWorkspacePlugin.csproj' Schedule an adding property: 'DllExportPostProcType':'0'
[18:42:57.8221] [Debug] Post-Processing type: None
[18:42:57.8520] [Info] Add .targets: '$(SolutionDir)packages\DllExport.1.7.3\tools\net.r_eg.DllExport.targets':8337224c9ad9e356
[18:42:57.8541] [Info] Add 'DllExportRestorePkg' target
[18:42:57.8550] [Info] Add meta library: 'F:\VSProjcets\PlSqlDeveloperPluginNet\packages\DllExport.1.7.3\gcache\$(DllExportMetaXBase)\$(DllExportNamespace)\$(DllExportMetaLibName)'
[18:42:57.8560] [Info] Add 'DllExportRPkgDynamicImport' target
[18:42:57.8890] [Info] Trying to remove Wz PackageReference records
[18:42:57.8900] [Info] Remove old Import elements:'net.r_eg.DllExport.targets'
[18:42:57.8910] [Info] Trying to remove old Import elements via pk:'8337224c9ad9e356'
[18:42:57.8920] [Info] Trying to remove old restore-target: 'DllExportRestorePkg'
[18:42:57.8930] [Info] Trying to remove dynamic `import` section: 'DllExportRPkgDynamicImport'
[18:42:57.8950] [Info] Trying to remove X_EXT_STORAGE Import elements: '545F5C4B-1B08-4609-AFCC-B4B670B2A8DD'
[18:42:57.8960] [Info] Find and remove 'net.r_eg.DllExport.targets' as an old .target file of the DllExport.
[18:42:57.8971] [Debug] Trying to remove pre-proc-targets: `DllExportPreProc`, `DllExportPreProcAfter`
[18:42:57.8980] [Debug] Trying to remove post-proc-target `DllExportPostProc`
[18:42:58.2880] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportIdent':'F3E3613C-3055-4F3B-ABBF-4420E14FEC23'
[18:42:58.3221] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportMetaLibName':'DllExport.dll'
[18:42:58.3241] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportNamespace':'RGiesecke.DllExport'
[18:42:58.3251] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportDDNSCecil':'true'
[18:42:58.3260] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportSkipOnAnyCpu':'false'
[18:42:58.3290] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportPlatform':'Auto'
[18:42:58.3300] [Debug] Export will try to use available platform from user settings.
[18:42:58.3311] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportOrdinalsBase':'1'
[18:42:58.3341] [Debug] The Base for ordinals: 1
[18:42:58.3351] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportGenExpLib':'false'
[18:42:58.3360] [Debug] Generate .exp + .lib via MS Library Manager: False
[18:42:58.3370] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportOurILAsm':'false'
[18:42:58.3381] [Debug] Use our IL Assembler: False
[18:42:58.3391] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportSysObjRebase':'false'
[18:42:58.3400] [Debug] Rebase System Object: False
[18:42:58.3411] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportLeaveIntermediateFiles':'false'
[18:42:58.3411] [Debug] Flag to keep intermediate Files (IL Code, Resources, ...): False
[18:42:58.3421] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportTimeout':'30000'
[18:42:58.3450] [Debug] Timeout of execution in milliseconds: 30000
[18:42:58.3461] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportPeCheck':'3'
[18:42:58.3461] [Debug] Type of checking PE32/PE32+ module: 3
[18:42:58.3471] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportPatches':'0'
[18:42:58.3481] [Debug] Applied Patches: None
[18:42:58.3491] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportPreProcType':'25'
[18:42:58.3501] [Debug] Pre-Processing type: ILMerge, DebugInfo, IgnoreErr
[18:42:58.3511] [Debug] 'IfsIntegrationPLugin\IfsIntegrationPlugin.csproj' Schedule an adding property: 'DllExportILMerge':''
[18:42:58.3521] [Debug] Merge modules via ILMerge 3.0.29:
[18:42:58.3580] [Info] Add 'DllExportPreProc' target
```

</details>

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GUI hands when applying Merge modules via ILMerge #170

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GUI hands when applying Merge modules via ILMerge #170

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