Demo compatability layer This will allow us to run older demos on newer versions of the game without breaking references in between. Before: - If you changed the name of an object it would break all demos before it. - If an RPC changed name it would break all demos before it Now: we can optionally cache all of the old names + hashes of objects and RPCs during each manifest build then on playback we can check for missing ones to fill in the blanks. Won't be a silver bullet but should prevent simple issues from destroying demos