Blender Git Loki

bli: generational_arena: insert_with() and try_insert_with()

bli: generational_arena: use better constructor and better if-else

Physics: Added basic visualisation for collisions, plus some cleanups to the Forces code

Merge branch 'master' into soc-2021-vse-strip-thumbnails

Thumbnail Caching

The caching code is updated to allow for separate thumbnail storage. The size
is taken as 0.25*render size as of now. flag set up to control when to store
thumbs. Image scaling done in preprocess stage using already present code for
crop and transform.

UV : Pack islands to box area

Adds a new operator to the UV editor - Pack islands to area
Allows the users to pack selected UV islands to a specified
area in the UV editor

Refer T78398

Implemented Sample Texture node with attributes.

Use generic attribute type for Remove Attribute.

DRW: ShaderLib: Add support for requesting lib to be appended to shader

Instead of appending using `BLENDER_REQUIRE`, shaders can now ask for
libs to be added after the shader's `main()` by using the
`BLENDER_REQUIRE_POST` pragma.

EEVEE: Film: Fix accumulator precision when zoomed out

Use viewspace instead of world space to compute pixel projection.
This fix issues when camera is far from origin and float precision would
produce artifacts.

Converted the Attribute Remove node.

Added a guide doc for converting attribute sockets.

Convert the scalar math node.

Cleanup: Addressed several build warnings and style guide issues

Renamed and implemented the "Attribute Set" node.

Fix missing subdivision evaluation when modifier is applied.

Make attribute copy between nodes work.

Cleanup: use doxy sections

Merge branch 'master' into xr-controller-support

XR: Add location/rotation locks for navigation