Blender Git Loki

Cleanup: more spelling corrections

Expand on solver descriptions

Cleanup: mostly comments, use doxy syntax & typos

- Use doxy syntax for functions.
- Use `pragma once` for header guard.

Merge branch 'master' into newboolean

LineArt: Prompt on baking finish.

Merge remote-tracking branch 'origin/master' into lanpr-under-gp

Merge branch 'master' into property-search-ui-v2

Merge branch 'master' into soc-2021-testing-frameworks

Removed the abstract base class as there is now only 1 Helper Test class, updated deform modifiers to ModifierTest

LineArt: Basic background task canceling.

Property Search: Add comment explaining menu search limitation

Merge branch 'master' into greasepencil-object

LineArt: Back-transform strokes to allow gp to sit at other positions.

LineArt: Disable line art object viewport selection by default.

LineArt: Prevent crash when using any sort of moving operators.

Merge remote-tracking branch 'origin/master' into lanpr-under-gp

Merge branch 'master' into newboolean

Refactor to defer building Plane for Faces until later.

This is a precursor to a big speed optimization in the "finding clusters"
code. Right now there is no speedup, maybe even a bit of a slowdown,
but following commits should lead to nice speed increases.

Fix T78065: OSL shader compilation fails on macOS

GPencil: Refactor and small fixes

- Removed dot at the end of prop description
- Replaced return NULL with asserts
- Changed default handle type for small curves
- Added comment