eliminated rmeshstate_t .pointer_vertex and .pointer_color (now must use R_Mesh_Verte...

eliminated rmeshstate_t .pointer_vertex and .pointer_color (now must use R_Mesh_VertexPointer and R_Mesh_ColorPointer instead - in a lot of code these don't need to be called as often)
renamed R_Mesh_State to R_Mesh_TextureState
made an alternate variant of R_Mesh_TextureState called R_Mesh_ResetTextureState which acts like it was given an empty rmeshstate_t (but is faster than R_Mesh_TextureState)
moved R_Mesh_VertexPointer and R_Mesh_TexCoordPointer calls out of the inner loops of the GLSL surface path
other related cleanups

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@6292 d7cf8633-e32d-0410-b094-e92efae38249