Support a move operation in the RealTimeModel

[mmacfadden]

Description It would be ideal if you could move an element from one part of the model to another in a single operation so that concurrent edits are not lots.

Is there a workaround in the absence of this feature? The best option now is to use a batch operation to remove the element from one part of the model and insert it into another. This is ok, but concurrent edits are lost during the move.