Per World Inventory

Update 1.3.0:
+ Default inventory loadout for each world group
+ New handling for banners, which correctly preserves patterns and colors
* Fixed error on start when 'data' directory is deleted

Update 1.2.1:
* Fixed bug where wrong gamemode was being applied

Update 1.2.1:
* Fixed option for saving gamemode not existing
* Fixed changes to config being lost on reload

Update 1.2.0:
* Rewrote ConfigManager. No visible changes to users.
* File 'default.json' will no longer be overwritten each startup