World id is the same across the entire server

[Techcable]

Right now the world id is stored in a field on the plugin object.

This means that it is the same across all words in the server.

EDIT: I made a plugin that fixes this Techcable/MinmapWorldId.mc. It has a new name instead of being a fork because the id storage is incompatible.

[webbrain-one]

Thanks for catching this! I opened PR #16 to fix it — the world id is no longer shared server-wide and is now handled per world.