now reloads rtlights only when map changes, not renderer restarts, this means rtlight...

now reloads rtlights only when map changes, not renderer restarts, this means rtlights changes are not lost when video mode changes
autoloads rtlights when map changes, even if not in realtime lighting mode
compiles lights and loads their cubemaps without checking for visibility first (to force loading on first frame, not during gameplay)

git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@4243 d7cf8633-e32d-0410-b094-e92efae38249