Add Barcode plugin
This allows to "Share..." a URL to generate a barcode, such as a QR code, that can be scanned with a phone or similar in case more sophisticated methods of data exchange, such as KDE Connect, are not available.
From, for example p-b-i I am now able to share a website URL and scan it on my phone. Code pretty much taken from Klipper.
- There's no "display-only" mode, so the "Run" will always be grayed out because it's basically asking for input but you're not supposed to continue from here
- Esc and close buttons missing but that seems to be a general bug in the JobView thingie