Miscellaneous fixes #35
Description
I don't know how to do pull requests and stuff but I've modified the file to address a few key issues. First, it now adds the author display name to files when an author is selected, and allows you to download more than one author (it skips the duplicate folder check, but still checks for filename duplicates). I removed a category check that limited the packs that were found. I also added some better error handling for the reported cases where things don't work. It still won't download them, but it will keep looking for other packs. By default I've also set duration to be a list of all possible durations but I think it will still function as previous if you manually use a fixed duration argument. There were also some packs that had problematic filenames (at least for windows) so I added a sanitize_filename code as well to strip things like colons and question marks.