Filter camera updates

If the scene creator gets the camera component and mutates it, we are sending that message to the renderer and the renderer is filtering those messages.
So it would be ideal to avoid sending unnecessary messages, add a filter at the transport level, and reset the camera to the previous value if there is a change.

Trace camera component mutations from the scene creator through the transport to the renderer, where these messages are currently filtered. Determine how the previous camera value is available; done means unnecessary camera messages are blocked before rendering and the camera is restored after a mutation.

Written by the indexing model from the issue text.