-Change cl_netgraph to use R_FillSpan for its graph drawing instead of directly accessing the frame buffer.
-Fixes color/translucency issue with cl_netgraph in 32bpp mode.

git-svn-id: http://odamex.net/svn/root/branches/rend32@3914 b0bcef46-2027-0410-bd56-ab726e9a1d04