message: Remove redundant inline specifier
  Inline is implied for static constexpr member variables.
diff: @@ -25,7 +25,7 @@ protected:
  void onMouseUp(NAS2D::EventHandler::MouseButton button, int x, int y);
  void onMouseMove(int x, int y, int dX, int dY);
  - static inline constexpr int sWindowTitleBarHeight = 20;
  + static constexpr int sWindowTitleBarHeight = 20;
  private:
  const NAS2D::Font& mTitleFont;
  