Changes

Update Mantle, migrate to new name for NamedComponentRegistry getAndDeserialize

Take advantage of loadables to reduce code for modifier module loaders, variables, and predicates

IdParser is now a loadable for the relevant resource location variant
IntRange is now a loadable for IntRange, it had a weird loading more of itself behavior going already
In addition to those two, added loadables for: SlotType, LevelingValue, RandomLevelingValue, ModifierEntry, SlotType, IToolStat, INumericToolStat, TagKey<Modifier>, MaterialVariantId, plus various enums

As part of this change, variable formulas now store "percent" as a field inside as it made it made it require less context shenanigans for parsing. Since we always want it for the tooltip anyways, does not hurt to place in that interface. They also are far simplier in other ways, notably all the loading logic was moved to a loadable.

Update to new IHaveLoader from Mantle

No longer generic, so a single class can provide a loader for multiple things

Update to latest version of Mantle predicates

Add names to loader registrie

Fix spilling fluid packet not setting handled

Its a dumb requirement, I have never seen a packet not set handled, hence why our interface autosets it

Migrate last usage of a Mantle generic loader to a loadable

Take advantage of the new version of IHaveLoader to merge some variable loaders

Tool variables now autoamtically work in all of the main three variable types, and we will register them to the relevant types automatically
Conditional stat variables now automatically work as mining speed variables, and will register to it automatically

Update to changes in Mantle for required loadable fields

As part of this change, move most usages of generic loader registry to defaulting fields

Update to latest ItemOutput

Migrate deserializing to the appropate helper and pass the appropiate boolean for serialization
Migrate all nullable ItemOutput usages to optional ItemOutput via its new static empty constant
Cleanup some calls to ItemOutput in datagen to use the simpliest argument method available

Update to DefaultingLoaderRegistry change

Delete the long deprecated ToolPredicate and cleanuo StatInRangePredicate

Not sure how it did not get deleted before

Update Mantle for all the recent changes