relighting v4.0160b file

v4.0160b

4/13 - added texture lights
4/15 - cap sprite & shadow distance limits by number of actors (scalability)
4/15 - general code cleanup
4/19 - fixed sector light adjustment for baked lighting, added sprite light adjustment for shadow length
4/20 - added texture light factor to menu for light placement

Note the Texture Light Factor can be adjusted to add or remove texture lighting.