1. 重写图片组件和阅读页图片加载逻辑，优化各页面下的图片表现，为新下载页做准备。
2. 阅读页手势区域宽度比例由1:4:1改为1:3:1
3. 修复阅读页在某些场景下翻页抖动的bug
4. 修复阅读页点击缩略图跳页时，进度条未同步更新的bug
5. 修复删除任务和图片无效的bug

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1. Rewrite the image widget and the image loading logic and optimize the performance, in order to prepare for the new download page.
2. Change Reading page gesture area width ratio from 1:4:1 to 1:3:1
3. Fix the bug of shaking in read page when turning page
4. Fix the bug that slider status is not updated after taping the thumbnail in read page
5. Fix the bug that Delete task and images is ineffective