Add dynamic item support

src/game/items/cup.js

@@ -1,10 +1,18 @@
-import ItemBuilder from "../../engine/builders/item";
-import Item from "../../engine/item";
-
-export default new ItemBuilder()
-.withID("cup")
-.withName("a cup")
-.withDescription("A standard coffee cup")
-.isTakeable(true)
-.isUsable(false)
+import ItemBuilder from "../../engine/builders/item";
+import Item from "../../engine/item";
+
+export default new ItemBuilder()
+.withID("cup")
+.withName("a cup")
+.withDescription("A standard coffee cup")
+.isTakeable(true)
+.isUsable(true)
+.withUseCallback((context) => {
+    const item = context.getItem("cup");
+    const cloned = item.clone();
+    cloned.name = 'A cloned cup';
+    console.log(cloned);
+    context.player.addItem(cloned.dynamicID);
+    context.print("You touch the cup and a new one somehow appears in your inventory.");
+})
 .create();