feat: frame info & stop at last frame

[fanmingfei]

• feat: frame info & stop at last frame

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[terrykingcha]

api有点奇怪。而且在实现中，还强制更改loop属性。是否可以如下设计
new SpriteAnimation({
loop: false,
times: 1, // 2, 3 都可以
forwards: true // 参考css的动画animation的forwards
})

[fanmingfei]

api有点奇怪。而且在实现中，还强制更改loop属性。是否可以如下设计 new SpriteAnimation({ loop: false, times: 1, // 2, 3 都可以 forwards: true // 参考css的动画animation的forwards })

控制播放次数还是在play的时候控制，这个API先不要变化。forwards已修改