- Move hint handling down to API layer
- Simplify stat data; old nc_stats counting can
be moved out to a separate mod. We only
need whether the player has seen or not.
- Invert inventory tab responsibility.
- Merge witness system in from crafting.
TODO:
- Redistribute hint registration responsibility
to individual mods.
- Test external mod compat.
- Retire old nc_stats and nc_guide systems.
- Add a way to reset hints.
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