图片是否选中的判断逻辑修改#182
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通过图片path来判断图片的选中；
原来是通过imageItem对的引用判断是否相等的，这样对于拍照得到的图片，无法在修改图片选择的时候显示为选中状态。改成通过图片path来判断，解决这个问题，但是比较性能上会有一定损失。
为ImageItem添加一个拷贝构造方法
复杂场景下，我们可能需要继承ImageItem，此时再初始化子类的时候ImageItem需要一个拷贝构造函数。