Changes

Migrate material stat loading to loadables

Loadables mean you have more control over parsing validation and reduces packet buffer boilerplate. Plus, its now easier to parse complex types from lists or objects
This also makes it easier to access material stat type properties like can repair

Migrate direct usages of ToolRebuildContext to IToolContext

rebuild context no longer has any unique properties, and IToolContext gives us a bit more flexability

Migrate overslime friend from volatile flag to a modifier tag

Was the only case of tool stats depending on volatile data in a currently used modifier. Ditching it lets me make volatile data run after tool stats instead

Drop volatile data from tool context

The only hook it was properly populated for was tool stats, and this commit removes the last usage of it in tool stats in piercing (which is unused anyways, and dropping the volatile usage is a lot cleaner)

Switch to modifier entry for process loot hook

Still need to either ditch that or put it in a proper hook...

Stat builder improvements

Allow fetching the current value of a stat (base or multiplier) in the modifier stat builder
Allow access to the modifier stat builder in the stat's build method
Will let you do weird stuff like a stat conditioned on another stat (future overslime stuff)

Make overslime use a stat instead of volatile data for capacity

Gives us free access to all relevant modules for stats and non-priority based multipliers
Took the opportunity to cleanup duplicate methods on overslime modifier, and to migrate the methods on the base modifier to modifier entries
TODO: decide whether I am satisfied with overcast affecting overlord

Move to a cleaner solution for forcing offhand unarmed attacks to 4.0 attack speed

Ditch base stats on the tool definition data

Base stats now only exist in testing, outside of testing everything uses the builder

Migrate overcast and overforced to JSON

Overlord requires capabilities beyond what the stat boost module supports so its stuck in a module for now