Arc Light now works on more graphics cards

There has been a recent fix by cyhawk of the dsource forums to make the lighting work on graphics cards that it previously did not work on. There has also been an improvement to set the filtering to linear for the penumbrae. In addition, the lightmaps have been updated to be more accurate and I've also added the python files used to generate those lightmaps, so folks can generate their own lightmaps at different sizes as they need.



Thanks, Daniel Darabos aka cyhawk! :)