添加游戏时钟，以及改变比例

Signed-off-by: Zhao Yanxia <1716655706@qq.com>
Merge branch 'master' of https://github.com/Cocos2dxGame/MHE
………………

Signed-off-by: Zhao Yanxia <1716655706@qq.com>
Merge branch 'master' of https://github.com/Cocos2dxGame/MHE
模式选择场景

Signed-off-by: Zhao Yanxia <1716655706@qq.com>