Update to work with latest version of libsgp4

plugins/channelrx/demodapt/aptdemodimageworker.h

@@ -37,6 +37,8 @@
 
 class APTDemod;
 
+using namespace libsgp4;
+
 class APTDemodImageWorker : public QObject
 {
     Q_OBJECT

plugins/feature/satellitetracker/satelliteselectiondialog.cpp

@@ -26,6 +26,8 @@
 #include "satelliteselectiondialog.h"
 #include "util/units.h"
 
+using namespace libsgp4;
+
 SatelliteSelectionDialog::SatelliteSelectionDialog(SatelliteTrackerSettings *settings,
         const QHash<QString, SatNogsSatellite *>& satellites,
         QWidget* parent) :

plugins/feature/satellitetracker/satellitetrackersgp4.cpp

@@ -29,6 +29,8 @@
 
 #include "satellitetrackersgp4.h"
 
+using namespace libsgp4;
+
 // Convert QGP4 DateTime to Qt QDataTime
 static QDateTime dateTimeToQDateTime(DateTime dt)
 {