* Add shulker box item tooltip translating
This commit adds support for previewing the items inside of a shulker box. This does not do a full translation, and only does enough to translate the item information to the client, so as to prevent any accidental item modifying/removing on creative mode.
* Swap values
- Merged ItemTranslator and ItemStackTranslator together.
- Split ItemTranslator into two classes: ItemTranslator and ItemRegistry. The registry is where items are registered, and the translator class is where item translation takes place.
- Made most of ItemTranslator's methods static and removed the initialization in Toolbox.
- Moved a handful of registry classes previously ending with 'Utils' to a 'Registry' class to be more fitting for the term.
- Moved inventory and block entity registration out of Translators.
- Renamed Translators to PacketTranslatorRegistry.
- Yeeted Toolbox.
- Minor cleanups and small refactors.