basic state switching from loading to running to editing

lib/input.ts

@@ -53,7 +53,9 @@ export class InputManager {
   }
 
   offKey(key: string | number) {
+    const events = this.keyEvents.get(key);
     this.keyEvents.delete(key);
+    return events;
   }
   offMouse(key: string | number) {
     this.mouseEvents.delete(key);