GH-76

- Closes #76
- Fixes the "Add multiple items" bug

When multiple items were added, the foreach mechanism caused the
actor to update multiple times and rewrite previously added items.
That's where some items were not actually added to an Actor (the
UI was working fine but not the backend part). So it seemed that
items are added (you can see them on the UI) but actuallythey
were not.
Now everything should work fine.

module/blades-sheet.js

@@ -88,9 +88,7 @@ export class BladesSheet extends ActorSheet {
 
       items_to_add.push(items.find(e => e._id === $(this).val()));
     });
-    items_to_add.forEach(e => {
-      this.actor.createEmbeddedEntity("OwnedItem", duplicate(e));
-    });
+    this.actor.createEmbeddedEntity("OwnedItem", items_to_add);
   }
   /* -------------------------------------------- */