[[ RefactorGraphics ]] remove contextscalewrapper.h #includes
[[ RefactorGraphics ]] update thirdparty submodule
[[ RefactorGraphics ]] add MCGContextDrawRectOfImage() function to libgraphics
fix potential memory leak in win32 version of MCRegionForEachRect()
[[ RefactorGraphics ]] change the return type of MCStackSurface::LockGraphics(...) to MCGContextRef
update win32 MCStackSurface implementations
[[ RefactorGraphics ]] implement replacement of MCStack method updatewindowwithbuffer() -> updatewindowwithcallback() on win32
[[ RefactorGraphics ]] implement MCStackSurface::Composite(...) on win32 using libgraphics
[[ RefactorGraphics ]] add Lock(), Unlock() methods to MCStackSurface, used to prevent screen updates during drawing operations
implement on win32