new cvars:
gl_picmip_world, gl_picmip_sprites, gl_picmip_other: offsets relative to gl_picmip for different kinds of textures (i.e. world stuff renders at gl_picmip + gl_picmip_world)
r_picmipworld, r_picmipsprites are kind of obsolete with this, but stay supported (setting them to 0 is essentially equivalent to setting gl_picmip_foo to -9999)
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@10235
d7cf8633-e32d-0410-b094-
e92efae38249
::stable-branch::merge=
4346809b10ed76664d514ef4f24b888abf9d9fdb