New renderer plugins

[edb]

Nice.

If you go with LuxCore, let dgud know. He already wrote to another coder in the past:
"When you are done with that I have an opencl port of luxrender for wings that needs some love  "

Thanks, I'll ask dgud about it.

I'm starting with Moonray and Luxcore for now, followed by Appleseed when Moonray and Luxcore plugins are able to export renderable scenes.

Currently I'm implementing the material dialog boxes for them, I'll see how that goes.