Blender Git Loki

Asset Catalog Tests: better path separator handling

Fixes by @LazyDodo to make the tests run on Windows.

This requires another change to get working properly, namely updating
`BLI_dir_create_recursive()` on Windows to call `BLI_path_slash_native()`
on the path before trying to create it. This will be handled in a different
commit, as it's not catalog-related.

Asset Catalog Tests: pass directory path instead of file path

Just a fix for a silly mistake.

Sculpt: cloth brush constraint solver is now multi-threaded

* Used a simple method of assigning constraints
to threads.
* Constraints that couldn't be assigned are solved
in the main thread.

Asset Catalogs: update explanatory comment in catalog definition file

Explain the new UUID-based format in the default comment at the top of
each catalog definition file.

Cleanup: asset catalogs, avoid shadowing field by function parameter

No functional changes.

Merge remote-tracking branch 'origin/master' into temp-asset-browser-catalogs

Support deleting catalogs from the UI

Adds a 'x' icon to catalogs to delete them (including children, if any).

There's no undo/redo for editing catalogs yet (since they are not
stored in .blend files), so deleting a catalog is a destructive action.
Therefore we show a confirmation popup.

Only catalog tree-items in the UI that represent an actual catalog can
be deleted for now. With T91451 done, this will change (every item
visible will be an actual catalog, so you'll be able to delete each).

Sculpt: move more brush settings to brush channels

Tracking Tools: Only show toolheader in Clip View

There are no tools available for Graph and Dopesheet view, so do not
show the tool header there.

Merge branch 'master' into tracking_tools

LineArt: Fix naming error

Merge branch 'master' into temp-vert-normals-cleanup

Merge remote-tracking branch 'origin/master' into temp-lineart-contained

Remove old TinyGLTF files

Merge branch 'master' into xr-controller-support

Update with changes from D10948, D12472

Fix brush defaults bug

Sculpt: Brush settings panel editor

* Moved brush settings (in sculpt mode) to
(for now) a new properties editor tab.
* Brush settings can now be individually configured
to show up in the workspace buttons.
* Brush settings can also be reordered.
* The new brush tab has a "preview" subpanel
to preview the workspace settings layout.
This is where settings are reordered.

UV grid: Resolve merge conflicts

Resolves merge conflicts that broke the subdividing and dynamic grid
implementations

Merge branch 'master' into soc-2021-uv-editor-improvements