Add QR code to share hotspot details

[nephros]

A suggestion to remember:

CodeReader: Cannot use WIFI-Code (not supported)

Looking at the camera app, not so straight, but lead me to read: GitHub - sailfishos/qr-filter-qml-plugin Well most of the work is done, but we can’t make a PR against the jolla camera source.

Jolla was talking about open-sourcing the Camera app IIRC, so maybe that can be added then.