Provide a way to show local videos and images in the phone, also support single-selection and multi-selection.
实现一款简单易用的本地图片和视频选择器示例，支持单选和多选功能。
本地图片和视频数据的获取和封装，可以完全自由定制化自己的UI，后续将继续优化加载速度和选择状态，先简单看一下目前的效果图：
定制化UI简单示例：
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