Added logging for altitude and compass

drone_controller/az_drone_controller.h

@@ -59,6 +59,9 @@ protected slots:
     // Slot that is called when the newPosition() signal below is emitted.
     void newPositionSlot(Telemetry::Position);
 
+    // Slot that is called when the newHeading() signal below is emitted.
+    void newHeadingSlot(double heading);
+
     // A mission file contains several action points. This is called
     // when the action point is reached. Indexing starts at 1.
     void missionIndexChangedSlot(int currentIndex, int totalIndexes);
@@ -75,6 +78,11 @@ signals:
     // captured in the main thread to avoid threading issues.
     void newPosition(Telemetry::Position);
 
+    // Signal is emitted when Ardupilot sends a new heading from the
+    // MAVSDK thread. Signal goes through the main event loop and is
+    // captured in the main thread to avoid threading issues.
+    void newHeading(double heading);
+
     // If Telemetry::health_all_ok() fails, then autopilot subscripes for the healt updates to
     // see exactly what is wrong. This signal is emitted to catch updates in the main thread.
     void newHealthInfo(Telemetry::Health);