It used to only route or broadcast, now the same packet can be both routed to it's own behaviour AND at the same time the broadcast listeners can get alerted of the same package such as universe-wide managers
Original Behaviour was using old methods for detecting entering/exiting universe,
they are now all under the same hood and the original is kept for UniverseEntranceManager
because it needs to enter the universe without itself. The internal behaviour kept under
a subnamespace of "Core.Internal" for the purpose that it might come in handy for other use cases.
