[C++] [lua] Add equipment slot tracking to enchantment item usage, audit ring enchantments

[Skold177]

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• I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

Sets up onItemUse and onItemUnequip to pass the equipment slot so that enchantments in the ring/earring slots stack and remove their effects properly. Also closes an edge case where a subType in the item effect could unintentionally be fed as a itemID (which is part of the reason this didn't work correctly to begin with)

Test included.

Steps to test these changes

!additem Armored Ring x2
/checkparam yourself
note defense
equip them both, see items stack
remove one, see one enchantment leave + lose 9 defense (1+ 8 from the enchantment)
remove the other

[Skold177]

Don't 100% know if this is the best way to do it this, so opening as a draft for feedback, if we like it, i'll undraft!