DIYFB-firmware-flasher - Add serial monitor to console

[DeeEmm]

Would be good to recycle the console output to work as a serial monitor so that users who use the firmware flasher to upload the firmware are able to access the serial API for fault finding / debugging in the event of an issue.

It seems as though this may be possible to do by adapting existing methods...

Write to console...

    def report_error(self, message):
        self.console_ctrl.SetValue(message)

    def log_message(self, message):
        self.console_ctrl.AppendText(message)

Need to figure out how to read from serial