Updated HallBench test scene

OpenCL CPU devices are now listed in the right place

Set release to v3.1

Added a new menu to select OpenCL compiler options

Enabled 'OpenCL overclock' for all test scenes

Fixed new scene MD5 sum

Set v3.0 in Info.plist for MacOS

Removed tag luxmark_v3.0beta2

Last round of updates for beta1

Merge