1. 修复windows系统上清除日志时的bug
2. 去除改变下载路径时的权限校验
3. 修复Windows系统下文件夹命名bug
4. 修复下载npe
5. cookie登陆时若格式错误，进行提示

1. Fix bug with clearing logs on Windows
2. Remove permission check when change download path
3. Fix bug with download path for Windows
4. Fix npe when download
5. Toast when cookie format is wrong