Add the ability to update objects within a scene

When importing a scene into design studio it creates a new component that includes this scene. Modifications of that scene like material setup and eventually lighting are then done inside this component.

If the user realises too late that something is missing from this scene or that some objects need to be refined there is currently no way to simply replace the outdated version of that objects with the new version without changing the scene-graph (importing would result in another component and not just that one object) or throwing away all the work already done. 

It would be nice to have an "update object" feature that simply swaps the old version with the new one.