This implements all the auto masking options in sculpt mode.
* Stroke: Only affects strokes that are initially under the cursor.
* Layer: Only affect strokes in the same layer as the initial strokes under the cursor.
* Material: Only affect strokes with the same material as the initial strokes under the cursor.
* Active Layer: Only affect strokes in the active layer.
* Active Material: Only affect strokes that use the active material.
The `Active Layer` toggle in the toolbar has been moved to this panel.
Resolves#130022.
Pull Request: https://projects.blender.org/blender/blender/pulls/132986
1eb39a8689