Journeymap Additions

Adds some extra features to Journeymap. 
This project is primarily used to work with and enhance the Journeymap-api and give devs an example to create their on addon-ons

Current Features: Will highlight on local loaded chunks if they are a slime chunk.

Notes:
Needs to be installed on the server if playing multiplayer. 

Known Issues:
Minimap has weird rendering of player arrow, this is an issue with Journeymap and will be addressed in a future version.