message: Use new `maximize()` method in `main`
diff: @@ -117,9 +117,7 @@ int main(int argc, char *argv[])
  const auto& options = cf["options"];
  if (options.get<bool>("maximized"))
  {
  - // FIXME: Evil hack exposing an internal NAS2D variable
  - extern SDL_Window* underlyingWindow;
  - SDL_MaximizeWindow(underlyingWindow);
  + renderer.maximize();
  }
  trackMars = std::make_unique<NAS2D::Music>("music/mars.ogg");
  