Changed directory structure and renamed applications

- autopilot -> drone_controller
- rtsp_ai_player -> ai_controller
- added top level qmake project file
- updated documentation
- moved small demo applications from tmp/ to misc/

drone_controller/az_utils.cpp

@@ -0,0 +1,21 @@
+#include "az_utils.h"
+#include <math.h>
+
+AzUtils::AzUtils() {}
+
+#define EARTH_RADIUS 6371.0 // Earth radius in kilometers
+
+double degrees_to_radians(double degrees)
+{
+    return degrees * M_PI / 180.0;
+}
+
+double AzUtils::distance(double lat1, double lon1, double lat2, double lon2)
+{
+    double dlat = degrees_to_radians(lat2 - lat1);
+    double dlon = degrees_to_radians(lon2 - lon1);
+    double a    = sin(dlat / 2) * sin(dlat / 2)
+               + cos(degrees_to_radians(lat1)) * cos(degrees_to_radians(lat2)) * sin(dlon / 2) * sin(dlon / 2);
+    double c = 2 * atan2(sqrt(a), sqrt(1 - a));
+    return EARTH_RADIUS * c;
+}