New command codes for the case of returning the qrcode string for commercial-automation

Below are the new commands that can be returned to commercial automation (function ContinuaFuncaoSiTefInterativo):

CommandDescription
50Commercial automation must display the QRCode on the screen. To do so, in this same command, it will be
returned the QRCode string with field identification 584.
51Commercial automation must remove the previously displayed QRCode from the screen, as SiTef already
returned a response to CliSiTef.
52Footer message, optional if there is space for it to be displayed, in which case the
QRCode has been displayed and is waiting for the customer to read it.