Sync Part's of the world (200m) at border to both worlds

[Zoriot]

Some parts of the world can be copied to the other world/server so it will be always visible - maybe that's a hole new feature.

Players should be automatically be teleported when they reach the limits of the world.
Should work with the linked_worlds setting & as seamless as possible. Also max_ settings should be used. <- seems to already be implemented and works for worlds. Spams Chat trough and don't really work for servers, so needs to be improved.

DEV-0075