Fix the corona bug. The render bug only though.
This is done by reviving alphamod and colormod arguments of
RSurf_ActiveCustomEntity.
The current implementation is a bit rough and needlessly copies the
worldentity; the struct isn't huge though and it's only done when
actually colormodding (and thus only for coronas, r_editlights, a few
sprites and nomodels).
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12525
d7cf8633-e32d-0410-b094-
e92efae38249
::stable-branch::merge=
c1ae70566d016a8f85acb3d4293c5dbc53886a51