Fixed sessions not being reset on world change

Revamped the WorldEditCUI API. The packet networking system has been replaced. The new CUI version is v4 (unofficial).
Unlike the old implementation, this system expect that the client also has WorldEdit installed,
with the networking being fully delegated into WorldEdit internals.
The new API can be found in this package: (com.falsepattern.worldedit.api)
A reference implementation can be found here: (https://github.com/basdxz/WorldEditCUI)

Added support for Schematica .schematic files, without the need for conversion
(can still load old schematics from worldedit)

Newly exported schematics now follow schematica specification

Improved compatibility with Forge Multipart

Added compatibility patches for ArchitectureCraft and Carpenter's Blocks

Fixed some slight memory leaks

Fixed an occasional ClassCastException crash

Fake Players can no longer trigger worldedit with the wand item (wooden hammer in right clicker machine)

(experimental) API for custom block ID saving logic. Not finalized yet,
do not use.