Fixes some of the build problems present in the project originally

However, there is still a problem with CGMouseDelta and CGTableCount in
macosx_event.mm and macosx_sys.h respectively. Also added a .gitignore
tailored for Xcode.
Fixing a few more build errors

Typedef’d ‘CGTableCount’ to u_int32_t, and changed ‘CGMouseDelta’ to an
int32_t.
Changed to the 10.7 SDK

Now Doom3 builds, but there are still tons of warnings.
Merge branch 'sandbox1' of git://github.com/0culus/Doom3-for-MacOSX-

Conflicts:
	neo/sys/osx/.DS_Store
	neo/sys/osx/Doom3.xcodeproj/project.pbxproj
	neo/sys/osx/d3xp.xcodeproj/project.pbxproj
	neo/sys/osx/game.xcodeproj/project.pbxproj
	neo/sys/osx/idlib.xcodeproj/project.pbxproj
	neo/sys/osx/oggVorbis.xcodeproj/project.pbxproj