Bukkit

Fixes:

- Fixed /btool tab completion and add Fawe history logging

- Fixed /b line not being able to be //undo'd

Additions:

- Re-added erode blend ball (/b eb)

- Support for 1.17(.1) and repackaged Fawe.

Changes:

- Requirement of Java 11 & major code refactoring in favor of Java 11 features.

- Remove Async* classes and properly let FAWE handle async execution in a thread safe manner.

- Removed lots of Favs-like methods with more suitable (FA)WE methods

- Removed voxel undo and undo user command. All history work is now handled by Fawe.