[enhancement] jump to next PDF file at end of file

[herrdeh]

Issue Summary

I'm using my andro to display parcel slips at the parcel shop. Each is one pdf doc, the clerk at the office has to scan all of them. Would be great to have an option to swipe through all the pdfs within the folder where all these pdfs live. Means: The app should jump to the next file when the last page is reached.

Not everyone will like this behaviour, so it should be selectable.