docs: private void setUpExtraKeys(GameSettings settings)
      {
          // Create extra key bindings here and pass them to the KeyManager.
          ArrayList<InternalKey> extraKeys = new ArrayList<InternalKey>();
          // Create a key binding to toggle between player and Malmo control:
          extraKeys.add(new InternalKey("key.toggleMalmo", 28, "key.categories.malmo")	// 28 is the keycode for enter.
          {
              @Override
              public void onPressed()
              {
                  InputType it = (inputType != InputType.AI) ? InputType.AI : InputType.HUMAN;
                  System.out.println("Toggling control between human and AI - now " + it);
                  setInputType(it);
                  super.onPressed();
              }
          });
  
          extraKeys.add(new InternalKey("key.handyTestHook", 22, "key.categories.malmo")
          {
              @Override
              public void onPressed()
              {
                  // Use this if you want to test some code with a handy key press
                  try
                  {
                      CraftingHelper.dumpRecipes("recipe_dump.txt");
                  }
                  catch (IOException e)
                  {
                      e.printStackTrace();
                  }
              }
          });
          this.keyManager = new KeyManager(settings, extraKeys);
      }