- Poly build now uses a new gizmo for pre-selection
which has the same behavior as loop-cut.
This replaces hack where mouse-move set the active element
which was no longer working properly because of missing
depsgraph updates.
- Multi-object support for poly-build.
- Support for deformed cage.
- Fix error where changing active object wasn't properly
refreshing the preselect gizmo (for loopcut too).
Currently holding Alt to select non-boundary element's isn't working.
