Register MAVSDK::Telemetry::Position type for Qt

Without this application can't get position events in Qt5 based systems.

Type: Improvement

src/autopilot.pro

@@ -1,8 +1,8 @@
 QT = core
-CONFIG += c++17 cmdline
+CONFIG += cmdline
 
 # Reduce compiler warnings from the ArduPilot headers
-QMAKE_CXXFLAGS += -Wno-address-of-packed-member
+QMAKE_CXXFLAGS += -Wno-address-of-packed-member -std=gnu++1z
 
 # MAVSDK pkg-config file is garbage. Add dependency manually
 QMAKE_RPATHDIR += /usr/local/lib

src/az_drone_controller.cpp

@@ -1,5 +1,6 @@
 #include <QCoreApplication>
 #include <QDebug>
+#include <QMetaProperty>
 #include <QThread>
 #include <QTimer>
 
@@ -74,6 +75,7 @@ bool AzDroneController::stateTelemetryModule(void)
 
     // Subscripe to position updates. Updated comes from different MAVSDK thread. Send position
     // as signal to this class (Qt::QueuedConnection) so that it's handled in the main thread.
+    qRegisterMetaType<Telemetry::Position>("Telemetry::Position");
     connect(this, &AzDroneController::newPosition, this, &AzDroneController::newPositionSlot, Qt::QueuedConnection);
     mTelemetry->subscribe_position([this](Telemetry::Position position) { emit newPosition(position); });