With the introduction of the brush assets project, there were a number
of changes to the overall API and UI that affect how user-defined
keymaps were made.
In all modes, users could either assign activating a brush via
right-clicking on the toolbar and assigning a shortcut, which would
bind to the `wm.set_tool_by_id` operator, or by manually inserting an
entry for `paint.brush_select`
For tools that have a one to one mapping for versions prior to 4.3
and ones post brush assets, we migrate the `wm.set_tool_by_id` `name`
property to the new name
For manually added entries, we swap from `paint.brush_select` to
activating the specific essential brush asset.
For Sculpt mode specifically, the number of tools in the toolbar
dropped significantly, any shortcuts that were created for these need
to be transitioned to activating a particular asset.
Finally, there are certain brushes that were expanded from a single
entry into multiple (e.g. multiple cloth brushes, paint brushes, etc)
For all of these cases, a reasonable default was picked.
Pull Request: https://projects.blender.org/blender/blender/pulls/130930
66bbdeba77