Get ALL story urls from existing books upgrade

[nerdguy1338]

There's an option in the config to check inside the epubs for a URL, if there's not one to use.

Very commonly, Royal road authors put in links to things they recommend in authors notes. Could an extra check be added to grab all supported URLs in selected books at once? The add URLs box already pulls from the clipboard optionally.

[JimmXinu]

That's a pretty niche case to make a general feature for. It's basically the opposite of the existing code, which is trying to only get the story URL for that book.

I'll leave this open for now, but I'm leaning against it.