Directors and Actors should be able to specify their namespaces.

[moolicc]

Currently an actor's namespace is in the format [owning layout].Name:[actor].Name.

We should permit an additional custom string in the stored scene that allows the actor to specify its own namespace.

A couple of ways to perform that:

1. Nest the custom namespace under the root [owning layout].Name namespace
2. Replace the root [owning layout].Name namespace with the custom namespace.