Bugfixes:
- Fix support for MC 1.21.1, for real this time
- Fix inventory drag bug when no .cis file is used on the server
- Don't show 'The resource pack server lost the resource pack' when the resource pack is skipped
- Fix mending behavior of custom tools in MC 1.14+
- Forbid storing larger or equally-large pocket containers inside pocket containers
- Allow pocket containers to use armor as internal item type