Blender Git Loki

Merge branch 'master' into soc-2021-knife-tools

Cleanup: Unecessary comments

Knife: Added orientation locking to knife tool

- Pressing X, Y or Z will lock current cut to corresponding axis.
- Pressing the same key twice will lock to local object axis.
- Scene orientation setting takes priority over this when set to anything other than global. This provides support for custom orientations.

Merge remote-tracking branch 'origin/master' into soc-2021-knife-tools

Cleanup: Return function parameters missing r_

Knife: New default snapping angle + code refactor

Set the default snapping angle to 30 degrees and refactored number input for angle snapping code.

Knife: Implemented D10853 - Constrained angle mode improvements

This is the first commit for the GSOC 2021 Knife Tool Improvements project. It implements D10853 which adds more control over constrained angle mode through new UI elements and number key input.