Lighted Layers 2

Slightly different approach to the lighted layers challenge. This is a PASeq effect that will work with any vectorizer or other effect that generates flat colored regions. The layered lighting effect just uses the Threshold and Adaptive Filter ip ops in succession over several iterations in a PASeq to build up the lighting for N raised luminance stacked layers. By layers i mean the effect looks like a series of stacked layers, but it's generated in a single canvas layer.