Increase number of materials, per-face materials, fixups for 4.7 #8
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Change material array index type to uint16 to allow more materials.
Allow individual materials per-face.
Minor fixups for compilation warnings/errors for 4.7.
NOTE: To actually use per-face materials requires a shader which can
synthesize correct UV coordinates for the vertical faces - by default
the UV coordinates are mapped to the XY vertex coordinates.