Development notes:

Possible Optimization:
	The shaded lights can be kept as an array instead of a linked list.

Possible Optimization:
	Omit uniform variables from the shading language.
	Treat all variables as varyings.


Todos:
OpenEXR input for textures
RiDisplayChannel & support
additional attributes, options visible from SL
bake, pointcloud and brickmap support
RiFilter support
trace subsets
patch crack stitching