Release new versions with support up to 1.21

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Release new versions with support up to 1.21

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Bumped versions in d885503. I don't have the energy right now to test all of them to guarantee it's going to work, though, much less to create the releases too. I might only update them for 1.21 because that's the version I'll be updating my own server to.

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I'm changing this goal to be 1.21 - even with the directory changes it's possible to support older versions thanks to the build script. Got some more thinking about that in #20.

I still need to test, but now I have to bump the versions again too. Build script support landed in 6e0f5eb

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Things I need to look into: how are other datapacks releasing versions where the only thing that changes is the version? Are they incrementing the version number? Are there other versioning systems that might solve this for me?

Going forward, here's how it's going to work:

• The versioning of the pack is based on features, not game compatibility. Game version compatibility is encoded by the file name itself, not the version of the datapack itself.
• Updates that do not introduce new features, for any reason, will be a patch update - this includes bumping the pack format. Dropping a support for a game version can be done in a patch, but dropping support for a feature cannot be done in a patch.
• Introducing support for an older version in the same datapack ZIP is also a patch update. Introducing support for an older version in a way that requires a new ZIP file does not require a patch, as this will typically be done in a branch and not actively kept up to date.

Some examples:

• With the 1.21 update, as I have not introduced any functionality changes, the versions will only bump the patch number.
• When I introduce support for the next version after 1.21 (very likely 1.21.1 🙄) I will bump the patch again.

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The PR is merged, now I just need to create the releases.

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All released.