Add connection info to a server as a QR code in the main screen

[danielzanella]

Currently, Buildron shows the current server as an IPv4 address in the lower left corner of the screen. Please add a QR code (possibly replacing the IPv4 address, or in the lower right corner) with the connection information, so as to enable augmented reality scenarios (allows, for example, a remote control running in a tablet, which you point to the monitor running the buildron you want to configure, and shows the options as an overlay over the monitor)