1. 支持手动设置画廊下载优先级，现在下载页面的画廊排序规则为，先按优先级正序，再按加入时间倒序
2. 修复自动检测新版本功能失效的bug
3. 修复阅读页bug
4. 修复详情页bug

1. Support assign download task priority manually, now we order galleries in download page by priority first and then insert time
2. Fix bug that fails to check latest version
3. Fix bug in read page
4. Fix bug in details page