* Major re-write.
* Use existing code from createFaces, obj_store_recall_properties and apply_view_rotation.
* "Edit" button is now defined by the "Recall object operator" script => has to be activated in the Add-On panel.
* A lot of cleanup.
* TODO: createFaces, obj_store_recall_properties and apply_view_rotation should really be put into a central file/library.