Note that this patch is to test out T66304: Tools, Selection & Gizmo design
Some parts of this patch are not well commented, this is not ready for final code review.
- Gizmos for most tools.
- Drag/Select tool option.
- Use single popover which includes tool options for Drag selector. (currently uses two buttons).
- Alt-LMB to activate the tool even when in selection mode.




