Move type constants

Prevent problems of circular dependencies when sepating actions from
items & sheets

module/item-sort.js

@@ -1,6 +1,6 @@
 import { Grammar } from "./grammar.js";
 import { RdDItemCompetence } from "./item-competence.js";
-import { ITEM_TYPES } from "./item.js";
+import { ITEM_TYPES } from "./constants.js";
 import { Misc } from "./misc.js";
 import { FLEUVE_COORD, TMRUtility } from "./tmr-utility.js";