Changes to help expose the new coordinate-frame widget in ParaView.
- Add a way to programmatically control which axis (if any) is locked.
- Add accessors to programmatically set the coordinate-axis vectors (in world coordinates), with orthonormalization applied.
- Add an implicit function for coordinate frames that ParaView can use the widget and representation classes to manipulate. This makes it possible to follow the same design as other property-widgets in ParaView.
FYI @spiros.tsalikis