#PR1154 v3.6.51

Merge pull request #1125 from DomCR/issue/1124_acad_image_dict-is-not…

…-exported

issue 1124

Merge pull request #1116 from DomCR/issue/1104_readmatrix4-fix

issue 1104

Merge branch 'master' of https://github.com/DomCR/ACadSharp

Merge pull request #1057 from DomCR/issue/1055_dimension-override-app…

…lied-by-dxfmap-fix

issue-1055 dimension override

Merge pull request #1028 from DomCR/issue/1025_dxfwriter-writes-hatch…

…-boundarypath-endangle-360-as-00

issue-1025

Merge pull request #1015 from DomCR/issue-968_dxfreader-AC1009

Improve DXF DIMENSION handling and refactor builder logic

Merge pull request #981 from DomCR/dwg-AC1015

Refactor DWG AC15 file header writing and section logic

Merge pull request #958 from DomCR/issue-956_dxfclasses-writer-fix

Issue-956 dxfclasses writer fix

Merge pull request #934 from DomCR/issue-891_CadDictionary-defaults

issue 891 default entries