Amulet-map-editor

* Updated to new rewritten cython NBT library.

Experimental features. Create backups of your world before using.

* Added cython mesh generator 392
* Improved world closing 570
* Improved threading 571

Amulet-Core Changes
* Added a cython leveldb wrapper for a bit more speed https://github.com/Amulet-Team/Amulet-Core/pull/177
* Rewritten the Java chunk interfaces to make maintenance much easier https://github.com/Amulet-Team/Amulet-Core/pull/176
* Added in temporary low level entity support (Requires activating with the `--experimental-entity-support` command line input)

**Full Changelog**: https://github.com/Amulet-Team/Amulet-Map-Editor/compare/0.8.19...0.9.0a1

* Added cython mesh generator 392
* Improved world closing 570
* Improved threading 571

Amulet-Core Changes
* Added a cython leveldb wrapper for a bit more speed https://github.com/Amulet-Team/Amulet-Core/pull/177
* Rewritten the Java chunk interfaces to make maintenance much easier https://github.com/Amulet-Team/Amulet-Core/pull/176
* Added in temporary low level entity support (Requires activating with the `--experimental-entity-support` command line input)

**Full Changelog**: https://github.com/Amulet-Team/Amulet-Map-Editor/compare/0.8.19...0.9.0a0

What's Changed
* Fix requirements by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/590
* Delete blocks does not create chunks by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/592
* Improved world closing UI by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/570
* Added a button to create empty chunks by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/593
* Int value before giving to SetValue by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/605
* fix system sound on nudge button by gentlegiantJGC in https://github.com/Amulet-Team/Amulet-Map-Editor/pull/606


**Full Changelog**: https://github.com/Amulet-Team/Amulet-Map-Editor/compare/0.8.20...0.8.21