Added r_cullentities_trace_expand and pad cvars, these configure additional ways to expand entity boxes when culling by traceline.
Added r_vis_trace feature which allows you to turn on traceline-based culling of portals, and r_vis_trace_surfaces lets you cull surfaces by traceline (slow and probably pointless, but a curious feature).
Added r_shadow_culllights_trace_expand and pad cvars.
Added sv_cullentities_trace_expand to make SV_CanSeeBox be at feature parity with R_CanSeeBox.
git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@12395
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