HAL_SITL: Integrating Silent Wings SITL with the sim_vehicle

libraries/AP_HAL_SITL/SITL_cmdline.cpp

@@ -27,6 +27,7 @@
 #include <SITL/SIM_Calibration.h>
 #include <SITL/SIM_XPlane.h>
 #include <SITL/SIM_Submarine.h>
+#include <SITL/SIM_SilentWings.h>
 #include <SITL/SIM_Morse.h>
 
 #include <signal.h>
@@ -126,6 +127,7 @@ static const struct {
     { "plane",              Plane::create },
     { "calibration",        Calibration::create },
     { "vectored",           Submarine::create },
+    { "silentwings",        SilentWings::create },
     { "morse",              Morse::create },
 };