Add airframe meta file loader

src/AutoPilotPlugins/PX4/PX4AirframeLoader.cc

+#include "PX4AirframeLoader.h"
+
+PX4AirframeLoader::PX4AirframeLoader()
+{
+
+}
+
+PX4AirframeLoader::~PX4AirframeLoader()
+{
+
+}
+

src/AutoPilotPlugins/PX4/PX4AirframeLoader.h

+#ifndef PX4AIRFRAMELOADER_H
+#define PX4AIRFRAMELOADER_H
+
+#include <QObject>
+
+class PX4AirframeLoader
+{
+public:
+    PX4AirframeLoader();
+    ~PX4AirframeLoader();
+};
+
+#endif // PX4AIRFRAMELOADER_H