Add refresh controls method in av canvas #383
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使用av-canvas时经常会有在外部修改VisibleSprite的rect属性情况,尤其是自定义clip(典型场景是自定义文字clip需要根据绘制情况返回宽高并更新到VisibleSprite),目前这些外部修改不能触发ctrls的调整,考虑到直接监听更新不太合适,所以添加了一个更新方法。