Hotfix: Restores old API compatibility that some plugins relied on

This build adds support for 1.19.3, please note that it contains a lot of internal changes. Please report any issues on our Discord or GitHub issue tracker, thanks.

=== v1.5.3 ===
+ Added support for 1.19.3 (and 1.20 experimental changes)
+ Added support for empty spawners (on 1.19.3+ only)
- Dropped support for 1.18 and 1.18.1 (1.18.2 is still supported)
* Fixed sheep shearing with simple stacking not working as expected
* Fixed multikill drops not accounting for the killer properly
* Fixed the /rs translate command throwing an error sometimes