message: Mark mButtonSkin field as const
diff: @@ -65,7 +65,7 @@ private:
  State mState = State::Normal; /**< Current state of the Button. */
  Type mType = Type::BUTTON_NORMAL; /**< Modifies Button behavior. */
  - ButtonSkin mButtonSkin;
  + const ButtonSkin mButtonSkin;
  const NAS2D::Image* mImage = nullptr; /**< Image to draw centered on the Button. */
  const NAS2D::Font* mFont = nullptr; /**< Buttons can have different font sizes. */
  