Character Generators

In MV3D, Character Generators are held at the Realm level. This is mainly because most games or worlds will have a single Realm. The minimal API for a character generator is relatively simple. First, it should be a pb.Viewable subclass. The only required call is view_getUI. This should return a ClassGenerator that will construct the client side of the character generator. From then on, the client side and server side can communicate to create the character.