Initial point light work. Still needs some cleanup and artifacts fixed. This works is need to continue work on cascaded shadow maps.
Bringing in my work on cascaded shadow maps. Currently the Sun lamp's frustum is fit to the active camera's frustum.
Sun lamps now do multiple render passes according to the number of cascades they have. These passes get rendered into a single texture using scissoring. Currently all passes are the same.
Adding UI to sun lamps for setting the number of cascades.