m.wantoverbright is gone

m.wantoverbright is gone
done manually by the few things that wanted it (tweaking the texrgbscale in other words, and their own local colorscale variables)
mesh_colorscale renamed to r_colorscale, and now available throughout rendering (no need to wait for the results of R_Mesh_State before scaling your colors)
lightscalebit renamed to r_lightmapscalebit
lightscale is gone (wasn't used)
msurface_t cached_lightscalebit renamed accordingly to cached_lightmapscalebit
starting work on converting the 2D system to use R_Mesh calls

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@2383 d7cf8633-e32d-0410-b094-e92efae38249