Server Backpacks!

• Added missing recipes.

• Probably fixes some recipes and bugs.

• Removed dev stuff.

Features

• Added colored backpacks.
• Added geyser support. See [Adding Geyser Support].

Improvements

• Made backpacks not able to be moved while opened.
• Some texture changes.

Internal changes

• Turn extended slots into stack data.
• Only check for container component if backpack's inventory is empty.
• Check resultStack is ContainerItem instead of checking in for loop.

Final release for version 1.21.3

• Fix bugs relating to shuffling and not saving.

• Fix #13

• Fixed log spam.

• Fixed backpacks having duplicated uuids.

• Fixed backpacks having duplicated uuids.

• Fixed backpacks not loading data.