Added MultiworldPoint and MultiworldArea which make sure that they stay linked to the correct dimension after server restarts. Will be needed for portals.
Some code fixes in general.
Moved handling of world-names to APIRegistry.
Fixed world-name API.
Finalized loading of worldZones and areaZones.
More code refactoring, some bugfixes for unanticipated nulls.
Hopefully final merge into this branch.