message: Rename type alias for `TakeMeThereSignal`
diff: @@ -15,14 +15,14 @@ struct MapCoordinate;
  class NotificationWindow : public Window
  {
  public:
  - using Signal = NAS2D::Signal<const MapCoordinate&>;
  + using TakeMeThereSignal = NAS2D::Signal<const MapCoordinate&>;
  public:
  NotificationWindow();
  void notification(const NotificationArea::Notification&);
  - Signal& takeMeThere() { return mTakeMeThereClicked; }
  + TakeMeThereSignal& takeMeThere() { return mTakeMeThereClicked; }
  void update() override;
  @@ -38,5 +38,5 @@ private:
  TextArea mMessageArea;
  bool mTakeMeThereVisible{false};
  - Signal mTakeMeThereClicked;
  + TakeMeThereSignal mTakeMeThereClicked;
  };
  