build(metadata): store requirement constraints semantically

[MattSturgeon]

• Normalize all version constraints in stonecutter.properties.toml to semver syntax.
• Parse all reqs constraints as semantic Constraint objects in ModMetadata.
• Render Constraints using toString() and toMavenFormat(), as appropriate.

I also tested each of our supported_mc_versions claims, and found that our 1.21.11 build does not actually work on 1.21.10. Therefore, I've dropped support for 1.21.10.

[github-actions]

📦 Changelog

Unreleased

Added

• A central landing page at https://minecraftfreecam.github.io (460)

Changed

• Re-rendered the project icon (439)

Removed

• Support for Minecraft 1.21.10 (482)

Fixed

• Marked 1.20.5 as supported by the 1.20.6 build (436, 452)