Allow reading of directly downloaded folders. #643

这个功能是用来解决问题的吗？ / Is your feature request related to a problem? Please describe.
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When I download directly to PC and put folder into EHviewer, the app doesn't recognize it.

描述你想要的解决方法 / Describe the solution you'd like
描述应通过何种行为来解决这个问题。
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Make the app recognize the files and import into the reader.

备注 / Additional context
还有别的想说的吗？
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Downloaded directly from ehentai and from app has different format.
The app should also read folder content when direct download from ehentai.