This puts all Directdraw-related code into a compile-time switch
'DIRECTDRAW_DEFINED'. To enable DirectDraw, you need to define this in
the snes9xw project file, and add a reference to drraw.lib in it too.
OpengGL support
full unicode support
x64 build support
shader support (D3D+OGL)
DDraw: vsync, dynamic buffer allocation
restored SPC save option
better window position saving
fixed crash during fullscreen switch