Mac OS X OpenGL and input module, using Carbon and AGL. Still in development, but...

Mac OS X OpenGL and input module, using Carbon and AGL. Still in development, but stable enough for a player to use. Notable problems and missing features: no hardware gamma support, no desktop menus, mouse movement scaling NOT disabled (please, if someone knows how to do that with Carbon, let me know), and the fact that it has only be tested on one computer so far (my iBook G4)...

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5700 d7cf8633-e32d-0410-b094-e92efae38249