This update is just a preparation for future updates, that devs can implement their Plugins using their own Advancement Managers instead of the Main Advancement Manager (which has been deprecated for quite a long time now)

Removed API Features:
- Main Advancement Manager has been removed
- File Advancement Manager has been added to re-implement the feature to add advancements using .json files now that the Main Manager is removed. However this one is not accessible but can be used by commands