add SDL and SDL_mixer libs to allow one-click compilation on windows
fix search&replace glitches in comments: 'auint32_t' => 'along'
fix typedef error (that is not compiled anyway)
remove scary typedef as it is not used anywhere
fix: do not force a song to be loaded from GRP but also from a flat file
Merge remote-tracking branch 'upstream/master'

Conflicts:
	Engine/Engine.vcxproj
	Game/Game.vcxproj
remove SDL and SDL_mixer libraries from repo