FeatureRequest: Check fingerprint by QR code

[biertz]

First of all, thanks to everyone involved for this great ecosystem. Encrypting your calendars and contacts is a gamechanger, in my humble opinion.

Now to my request: I think it would significantly simplify the fingerprint comparison workflow if the pop-up allowed me to scan the the fingerprint of the person I want to share a collection with as a QR code. Comparing numbers is quite tedious.