Add matcap and vertex location quantization

matcap quantization simply quantizes matcap colors to a configurable #
of equal-sized steps.

vertex location quantization snaps each vertex location to a quantized
location in object space. You can control the direction relative to the
mesh normal that this quantization occurs. So if you have skintight
clothing, set base direction to -1 and clothing direction to 1. Then
skin will quantize inwards, and clothing will quantize outwards. Areas
of high curvature (s.a. nips) may still cause problems, so I also added
a mask feature.

Finally, fix an issue where exploding the mesh causes outlines to appear
at the world origin.

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