Add a LootTable Serializer

[Burbulinis]

Description

This PR adds a LootTable serializer.

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Target Minecraft Versions: any
Requirements: none
Related Issues: none

[ShaneBeee]

Just a few minor little things

[sovdeeth]

Do you think it's alright to save these when the available loottables could be changing between variables loads? Since it's only saving the key, it's reliant on the server environement not changing between saving and loading. If a data pack is removed, it could cause these variables to fail to load.

[ShaneBeee]

Do you think it's alright to save these when the available loottables could be changing between variables loads? Since it's only saving the key, it's reliant on the server environement not changing between saving and loading. If a data pack is removed, it could cause these variables to fail to load.

In all fairness, the same could be said for anything that has a RegistryClassInfo, as well as ItemType.
Mojang lately has been breaking/changing a lot of things, and it could happen at anytime.
They could remove a biome, or rename it. (or as you mentioned, data pack removal)
They could rename an item (ex: when they changed grass_path to dirt_path).
In all these cases variable loading would fail on said variable.
At this point in time we almost have to just say "Yep, that was a #MojangMoment" and hope for the best.

[sovdeeth]

Good point, it's the same for blocks and removing worlds too. Just wanted to confirm there wasn't a better way.