4.5.0 (NeoForge 1.21.1)

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Primarily more changes and fixes for Bulk Compression again.

Reworked compression overrides to use a data map in favour of the old tag, allowing for specific expected variants for a given override item (see https://github.com/62832/MEGACells/pull/165)
- Fixes some overrides potentially leading to bizarre compression chains generating (see https://github.com/AllTheMods/ATM-10/issues/1864)
- The old tag remains in use as a fallback, but is deprecated and subject to removal. Modpack developers are encouraged to switch away from the tag to the new data map. The default tag JSON from MEGA has also been removed and migrated to the new data map JSON.
Reworked compression chains to ensure they are fully immutable.
Updated Simplified Chinese localisation (courtesy of @ChuijkYahus)