[Feature] Sortable inventories and adversary/environment drag/drop (#1357)

* Add ability to sort inventories in player and party sheets

* Format base actor sheet

* Check item validity when creating on an actor

* Block dragdrop on adversaries and environments

* Support drag and drop in adversary and environment sheets

* Fix regression with dropping to character sheet

* Move vault when created handling to domain card preCreate

module/data/actor/adversary.mjs

@@ -141,6 +141,10 @@ export default class DhpAdversary extends BaseDataActor {
         return this.parent.items.filter(x => x.type === 'feature');
     }
 
+    isItemValid(source) {
+        return source.type === "feature";
+    }
+
     async _preUpdate(changes, options, user) {
         const allowed = await super._preUpdate(changes, options, user);
         if (allowed === false) return false;