ItemSwapper

Due to time constraints, this release does not yet contain the new items in the built-in palettes, or some new worked on features. Just an early release for 1.21.11 so the Hermits can update.

What's changed

• Add 1.21.11 support
• Change tooling to Stonecutter

Full Changelog: https://github.com/tr7zw/ItemSwapper/compare/v0.8.3...v0.8.4