V0.3 (5, Apr 2009)
  - Added ReleaseBitmap method to ISpriteSubimage & IBackground classes, which deallocates image's bitmap from memory

V0.2 (4, Apr 2009)
  - Added ISounds (CGMAPI::Sounds) & ISound classes, which gives access to sound resources
  - Several small fixes in resource accessors classes (IBackgrounds, IScripts...)