MAVLink: Update complete app to support MAVLink 1 & MAVLink 2. Add MAV_PROTO_VER param to switch between them

src/modules/mavlink/mavlink_receiver.cpp

@@ -2084,6 +2084,10 @@ MavlinkReceiver::receive_thread(void *arg)
 				/* if read failed, this loop won't execute */
 				for (ssize_t i = 0; i < nread; i++) {
 					if (mavlink_parse_char(_mavlink->get_channel(), buf[i], &msg, &status)) {
+
+						/* check if we received version 2 */
+						// XXX todo _mavlink->set_proto_version(2);
+
 						/* handle generic messages and commands */
 						handle_message(&msg);