Blender Git Loki

USD importer bug fix.

Fixed error in merging logic when creating
readers, which was causing missing Xforms
in the Blender hierarchy.

Pydoc: BGL: update links

Format changes.

Pydoc: Fix bpy.utils submodule showing in main toctree

Pydoc: Move builtin GPU shader information to code

This fixes a compile warning for sphinx.
This commit includes some reformating of the information.

Cleanup: Pydoc strings

Pydoc: Cleanup: Rename function

The new name makes more sense as the file is called index and we are not
writing the contents of all rst files

Pydoc: Add index and genindex to main index

Pydoc: Remove old note about new module in 2.65

Pydoc: Add submodule heading to submodule lists

Pydoc: Fix duplicate totree for freestyle

Cleanup: make format

USD importer: improved stage traversal.

Now creating readers in a recursive traversal of the
USD prim hierarchy, which simplifies pruning of empty
Xform and Scope subtrees.

Exact Boolean: let Collection be empty.

With an empty collection, Exact Boolean performs the useful function
of removing self-intersections.

CMake/macOS/OpenMP: copy the library near tests.

For multi-config generators, tests are in `bin/tests/<config>` folder.
and OpenMP cannot be found at `@executable_path/../Resources/lib`.
So create that folder and put the library there to be used by tests.

It is not ideal to copy the library around. When minimum CMake version
is changed to 3.12, FindOpenMP by CMake can be used for this whole
block of code. Then a nice rpath based solution can be used.

Cleanup: use macro for comparing file versions

Already done in most of the versioning code.

Cleanup: spelling

Cleanup: remove unused Modifier stackindex struct member

Cleanup: remove unnecessary comments

Cleanup: use C comments for descriptive text

Follow our code style guide by using C-comments for text descriptions.