[FSD] Add slowfast and stopped packets for Velocity

src/blackcore/fsd/visualpilotdataupdate.h

@@ -16,6 +16,9 @@
 
 namespace BlackCore::Fsd
 {
+    class VisualPilotDataPeriodic;
+    class VisualPilotDataStopped;
+
     //! Pilot data update broadcasted to pilots in range every 0.2 seconds.
     class BLACKCORE_EXPORT VisualPilotDataUpdate : public MessageBase
     {
@@ -34,6 +37,12 @@ namespace BlackCore::Fsd
         //! PDU identifier
         static QString pdu() { return "^"; }
 
+        //! Return a periodic update with the same values
+        VisualPilotDataPeriodic toPeriodic() const;
+
+        //! Return a stopped update with the same values
+        VisualPilotDataStopped toStopped() const;
+
         //! Properties
         //! @{
         double m_latitude      = 0.0;
@@ -52,7 +61,7 @@ namespace BlackCore::Fsd
         double m_noseGearAngle      = 0.0;
         //! @}
 
-    private:
+    //private: // not private: used in CFSDClient::handleVisualPilotDataUpdate
         VisualPilotDataUpdate();
     };