Moved values out of `ArmorItemCanHoldMods` and into frozen set
Added Tpls to spelling dictionary
Changed list parameters to be `ienumerable` or `icollection` where possible
Made `ArmorItemHasRemovablePlateSlots` use class property directly
Made `ItemHasSlots` return false when checked item doesn't exist instead of throwing an unhandled exception
Folded `HasBuyRestrictions` logic into one line
Chomp
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