Two main interfaces are introduced:
- Container (chest, furnace, etc)
- MenuAccessor (includes Containers but also anvils, crafting tables etc. which are not containers)
Containers have inventories, locks, and everything from MenuAccessor
MenuAccessors have obstruction checks, and openToUnchecked() for plugins to use
I opted not to include precondition checks in openTo() because it's possible
to replicate those using the provided APIs if desired.
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