1. Fixed Patreon can not get artist info when input artist's url
2. Add download retry delay because fantia error 429

If you have already downloaded the version 1.6.1.0, that you can only download the Diff.zip and override source file. The version 1.6.X is different from before, so install to a new folder.

1. 修复Patreon无法使用作者链接开始下载的bug
2. 因为fantia的429错误，所以追加下载重试的延迟判定

如果你已经下载了1.6.1.0版本，你可以只下载Diff.zip覆盖掉源文件即可。 1.6版本与以前的不兼容，所以请放到新的文件夹里