Changed how cubemaps are held in memory, making all images basically just 3d textures.
Don't start up at all if no game data is found.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5570 fc73d0e0-1445-4013-8a0c-d673dee63da5
Added a couple extra pixel formats to the dds loader.
Format conversions are handled via a table. Additional conversions added.
git-svn-id: https://svn.code.sf.net/p/fteqw/code/trunk@5565 fc73d0e0-1445-4013-8a0c-d673dee63da5