added basematerialflags/currentmaterialflags to texture_t which completely replace...

added basematerialflags/currentmaterialflags to texture_t which completely replace the SURF_* flags and SURFRENDER_* flags
eliminated the flags and plane fields from q1bsp surfaces
q1bsp texture_t generation now sets supercontents (eliminating need for the SURF_SOLIDCLIP surface flag)
split R_UpdateTextureInfo into two versions for updating a single texture and updating a whole entity's textures respectively, so transparency rendering can now call R_UpdateTextureInfo instead of having duplicate code

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@5080 d7cf8633-e32d-0410-b094-e92efae38249