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):

| Command | Description | | :-----: | -------------------------------------------------- -------------------------------------------------- -------------------------------------------------- --------------- | | 50 | Commercial 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. | | 51 | Commercial automation must remove the previously displayed QRCode from the screen, as SiTef has already returned a response to CliSiTef. | | 52 | Footer 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. |