Refactor file extension filters in CMake and QMake configurations.
Gxx extension used as a "old-way-template" to repeat .cxx content.
Marking gxx as a source file instead of header.
Moving to absolute path for the gxx integrations.
Added option BUILD_SOVERSION_NUMBERS to manage SOVERSION length.
Default option value is set to 2 (major.minor) instead of previously used 1 (major),
excluding Android/Emscripten/Windows platforms that use 0 by default.
Removed unused header Aspect_XWD.hxx.
Removed redundant includes of unused X11 extension headers.
Added missing dependency on pthread to TKDraw.
Added "-z defs" linker flag to qmake projects to detect missing library dependencies.
Removed unused CSF_MotifLibs.
MACOSX_USE_GLX has been renamed to HAVE_XLIB and now configurable on Linux target.
Xw_Window.hxx now export class on non-Linux platforms.
OpenGl_Window now creates an off-screen EGL surface also in case of
window-less desktop setup (e.g. with disabled Xlib on Linux).
Draw_Window - code has been cleaned up.
Class definition has been unified across platforms when possible.
Unusued constructors have been removed.
Internal header files (MainWindow.h, init.h, etc.) have been renamed to .pxx
to avoid their unexpected distribution in "inc".
Added option USE_FREETYPE to CMake configuration, enabled by default.
Added handling of HAVE_FREETYPE macros.
genproj now overrides env.bat/env.sh on template change.
genconfdeps.tcl now puts %PRODUCTS_PATH%/$PRODUCTS_PATH into generated custom.bat/custom.sh scripts.
Added missing CSF_winmm definition to OccToolkit.pri
Added adm/qmake/Occt.pro for building OCCT using Qt Creator.
genproj/genconf scripts have been extended with an option defining project format.
Draw_Appli now tries resolving CASROOT/DRAWDEFAULT/CSF_OCCTResourcePath/CSF_OCCTSamplesPath
locations within usual OCCT development/installation environment.
Added missing TKShHealing dependency to TKDraw/DRAWEXE (inherited from TKMesh).
OSD_Process::ExecutableFolder() - added method returning executable folder.
