Blender Git Loki

Merge branch 'master' into asset-metadata

Merge branch 'asset-metadata' into asset-browser

Adapt to new file read/write design from master

Partially a compile fix for previous commit. But also moving asset-data
read/write into `asset.c`, like we do it for more and more
data-structures in master.

Merge branch 'master' into asset-metadata

Fix compiling and warning on MSVC

Also use #pragma once instead of include guards, just like master now.

Merge branch 'asset-metadata' into asset-browser

Follow up to previous commit, rename asset operator in Outliner

Forgot to rename it in the Outliner as well ("Create Asset"->"Make
Asset").

Merge branch 'asset-metadata' into asset-browser

Keep assets local to the file, don't copy them

Previously my idea was that when creating an asset for the user
repository, we'd always create a deep copy of the data-block for storage
in the repository.
However for the initial design, we decided to not let Blender
automatically save things into a repository. The user has to mark a
data-block as asset and save the file, so the asset is stored as part of
that file. By adding a path to the Preferences, all .blend files in that
path become part of a repository and users can then access their assets
in different projects through the Asset Browser (not done yet).

Because of this, the operator is now called "Make Asset" again, not
"Create Asset". We don't create a new asset, we just add asset data to
an existing data-block.

Support dragging assets from Asset Browser into viewport

This should work for objects, groups, materials, images. It can be added
for more data-block types.

The Asset Browser UI code basically forwards some asset information
(like the path) to the general UI code. This can then append the asset's
data-block once dropping it into the viewport.

Merge branch 'asset-metadata' into asset-browser

Merge branch 'master' into asset-metadata

Some (partial dummy) additions to the Asset Browser UI

* Add search button
* Add filter and display options popups from the File Browser. These might have
to be tweaked for the Asset Browser, but adding the buttons as a first step
to fill the space.
* Add properties sidebar toggle button (gear icon, like in the File Browser)
* Add dummy repository selector
* Use placeholder icon for Asset Browser editor

Add list of asset categories to the left sidebar

The categories are the same you can find in the File Browser filter popup:
Scenes, animations, object & collections, geometry, shading, images & sounds,
environments and miscellaneous.

And again, all of this is more of a prototype, things will change a lot still.

By default, show object assets in $HOME/assets.blend

Obviously using this fixed path is a temporary hack. Right now goal is really
just to get quick visual results to test and evaluate.

Cleanup: Rename SpaceFile.mode to SpaceFile.browse_mode

This differentiates between regular file browsing and asset browsing.

Start preparing the Asset Browser UI

* Make sure exactly the wanted regions are visible
* Make sure toggling back and forth between the Asset and the File Browser
works fine (with correct region setup and other settings)
* Hide File Browser only region contents (e.g. panels on the left)
* Use thumbnail mode as default for the Asset Browser

Merge branch 'asset-metadata' into asset-browser

Updates for changes in master

Needed after last merge.

Add Asset Browser as sub-editor for the File Browser

This is the code design we agreed on to go with for now. See T73366.