fixes for netgen batchmode
added a FFMPEG preprocessaor definition
Switched to v120 compiler
enabled MP compilation, changed platform toolset to v120
removed unsafe use of boolean
Added the FFMPEG dlls to the "installation process"
Updated the "Release(OCC)" Configuration
Removed a wrong filename from OCC configuuration
Changes for OCC 6.5.3
Changed to platformtools v120, added zlib in the postbuild step