wifi: Add QR code to share Wi-Fi networks

Many devices are able to scan a specifically formatted QR code to connect to a wifi network. To make sharing of wifi connections easier, it would be helpful to display such a QR code in the wifi settings.

A button is added to the wifi connection row. This row is shown in the general wifi settings panel, as well as in the "Known Wi-Fi Network" dialog. Clicking the button opens an additional dialog, which shows the QR code.

Closes #2074 (closed)

Wifi-QR-Button Wifi-QR-Dialog

Edited by Hendrik Müller

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