====== Animation player for ui ======

  ● public static void PlayAutoAnim (GameObject obj, AnimationClip animClip) 
  ● public static void Play (GameObject obj, AnimationClip animClip) 
  ● public static void Play (GameObject obj, string animStateName) 
  ● public static void Stop(GameObject obj, AnimationClip animClip) 
  ● public static void StopAtFirstFrame (GameObject obj, AnimationClip animClip) 
  ● public static void RevertPlayAnim (GameObject go, AnimationClip animClip) 

  ● PS: UIAnimLegacyForUGUI，[Hack]矫正修改对象alpha值无效的处理