Implement copier, an item that copies the value displayed by other items

src/Dodge/Data/Item/Use.hs

@@ -43,6 +43,7 @@ data ItemUse
     | UseAttach {_uaParams :: AttachParams}
     | UseInt {_uInt :: Int}
     | UseNothing
+    | UseValue {_uValue :: Either Int String}
     | UseScope {_uScope :: Scope}
     | UseBulletMod {_ubMod :: BulletMod}
     | UseToggle {_useToggle :: Bool}