USDLux Cycles Compatibility - Cylinder Lights & Spotlight Angles > 180

Hey all, I've been working on getting Blender Cycles compatible with the USDLux light specifications.

Everything passes except for two, usd-specific aspects; Cylindrical Lights and Light Angles Greater than 180

You can see the USDLux merge request here: projects.blender.org/blender/cycles/pulls/74