Changes

* There are some idiosyncrasies between various usages of keywords. One thing to notice is that recipes.json and npcs.json use a keyword of the form "EquipmentSlot:x", e.g., "EquipmentSlot:Ring". There are even some npcs who like items with the keyword "Ring" and others who like items with the keyword "EquipmentSlot:Ring". However items.json does not have any keywords like "EquipmentSlot:x". Items instead will usually (or maybe always) have two identical keywords, for example most (or all rings) have "Ring" listed twice in their keywords (and similarly for other slots). Here on the wiki, there is just one item category for Ring.