[FEATURE] Add an API for other modules to integrate with.

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Ideally, this would have methods that do the following:

• Return a map of spells when passed an item, or false if not an item with spells.
• Return the item when passed a spell that is part of an item.
• Along with all these returns, always return the status of the item with spells. This status indicates whether the spells should be visible/accessible or not (e.g. invisible when item is not attuned, identified, or equipped).

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Fixed in v12.0.0.