Rename PathRay members.

Also use members for AllVisibility instead of hand-coded values
Update the pre-compiled CUDA kernels.
Update for changed enum member name.
Add option to tester to render quietly.
First translate, then rotate.
XML: Factor support for Mix node (RGB).
XML: Factor support for Mix Closure node.
XML: Add support for emission BSDF node.
XML: Add support for Math node.
XML: support AddClosure node.
Add a test file.
Material import code
Material import code