[Cocos2d-x] Touch 이벤트 추가

void GameScene::onEnter()
{
	auto touch = EventListenerTouchOneByOne::create();
	touch->onTouchBegan = std::bind(&GameScene::onTouchBegan, this, std::placeholders::_1, std::placeholders::_2);
	
    // 람다식으로 작성 가능
	touch->onTouchBegan = [=](Touch*, Event*)->bool { 
		CCLOG("touch screen");
		return true; 
	};
    
    getEventDispatcher()->addEventListenerWithSceneGraphPriority(touch, this);
}

bool GameScene::onTouchBegan(Touch * t, Event * e)
{
	CCLOG("touch screen");

	return true;
}