On Apple with XCode 9.4.1 and onwards, the compiler optimization is disabled for method gp_Mat::Transpose() as optimizer generates invalid code when that method is used.
Some refactoring of the code affected by this bug.
License statement text corrected; compiler warnings caused by Bison 2.41 disabled for MSVC; a few other compiler warnings on 54-bit Windows eliminated by appropriate type cast
Wrong license statements corrected in several files.
Copyright and license statements added in XSD and GLSL files.
Copyright year updated in some files.
Obsolete documentation files removed from DrawResources.
