message: Remove use of virtual when override is used
diff: @@ -73,7 +73,7 @@ public:
  SelectionChangedCallback& selectionChanged() { return mSelectionChanged; }
  protected:
  - virtual void onMouseDown(NAS2D::EventHandler::MouseButton button, int x, int y) override;
  + void onMouseDown(NAS2D::EventHandler::MouseButton button, int x, int y) override;
  virtual void onMouseMove(int x, int y, int relX, int relY);
  void onMouseWheel(int x, int y);
  virtual void slideChanged(float newPosition);
  