Deprecate world names

[Machine-Maker]

World's should not be identified with strings, they should be identified with namespaced keys.

TODO

• [ ] Check that timings reports won't be affected
• [ ] World component display name
• [ ] MapItemSavedData's level name usage
• [ ] CraftServer's Map<String, World> using level name
• [ ] World adventure's Name pointer
• [ ] Move hunks into their correct patches
• [ ] Paper comments in the right places

[stale[bot]]

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