New command codes for the case of QRCode String return for commercial automation

Below are the new commands that can be requested from commercial automation (function ContinuaFuncaoSiTefInterativo):

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