message: Consistently use {} for sub-object initialization
diff: @@ -15,14 +15,14 @@ using namespace NAS2D;
  MainMenuState::MainMenuState() :
  - mBgImage("sys/mainmenu.png"),
  + mBgImage{"sys/mainmenu.png"},
  btnNewGame{constants::MAIN_MENU_NEW_GAME, {this, &MainMenuState::onNewGame}},
  btnContinueGame{constants::MAIN_MENU_CONTINUE, {this, &MainMenuState::onContinueGame}},
  btnOptions{constants::MAIN_MENU_OPTIONS, {this, &MainMenuState::onOptions}},
  btnHelp{constants::MAIN_MENU_HELP, {this, &MainMenuState::onHelp}},
  btnQuit{constants::MAIN_MENU_QUIT, {this, &MainMenuState::onQuit}},
  lblVersion{constants::VERSION},
  - mReturnState(this)
  + mReturnState{this}
  {}
  