Previously the brush names were used which had the limit that:
- Brush names that were deleted wouldn't show up in the toolbar.
- Naming collisions between user defined brushes and existing tools
broke tool selection.
Now brushes are created as needed when tools are selected.
Note, vertex/weight paint combine tool and blend modes,
this should be split out into a separate enum.
This allows gizmo groups to store properties in the tool.
This makes sense for gizmo options which only control gizmo display and
don't control operator execution.
Unlike similar kinds of properties,
this isn't accessible via the gizmo-group-type instance.
For now the it's only stored in the workspace tool as can be done for
operator properties, so each instance doesn't have different settings
which would be confusing from a user perspective and complicate access
from the top-bar.
Later we could add gizmo-group properties if needed.
In some cases we want associate use an operator for a tool
for introspection, so we can for eg, automatically
use the same binding for in the popup toolbar.
Space-G/R/S for transform now work as accelerator keys again.
Also Space-E for extrude.
Key shortcuts and explanation about how to use the tool should go to the
status bar, but other info can in the header so it's near where the user
is working. This distinction has not been made yet for all operators.
This patch adds support for:
- Per space-type tools (3D view and edit).
- Per mode tools (object, edit, weight-paint .. etc).
The top-bar shows the last activated tools options, this is a design
issue with using a global topbar to show per-space settings.
See D3395
