AP_ADSB: add static create method

libraries/AP_ADSB/AP_ADSB.h

@@ -29,22 +29,23 @@
 
 #include <AP_Buffer/AP_Buffer.h>
 
-class AP_ADSB
-{
+class AP_ADSB {
 public:
+    static AP_ADSB create(const AP_AHRS &ahrs) {
+        return AP_ADSB{ahrs};
+    }
+
+    constexpr AP_ADSB(AP_ADSB &&other) = default;
+
+    /* Do not allow copies */
+    AP_ADSB(const AP_ADSB &other) = delete;
+    AP_ADSB &operator=(const AP_ADSB&) = delete;
+
     struct adsb_vehicle_t {
         mavlink_adsb_vehicle_t info; // the whole mavlink struct with all the juicy details. sizeof() == 38
         uint32_t last_update_ms; // last time this was refreshed, allows timeouts
     };
 
-
-    // Constructor
-    AP_ADSB(const AP_AHRS &ahrs) :
-        _ahrs(ahrs)
-    {
-        AP_Param::setup_object_defaults(this, var_info);
-    }
-
     // for holding parameters
     static const struct AP_Param::GroupInfo var_info[];
 
@@ -75,6 +76,11 @@ public:
     void handle_message(const mavlink_channel_t chan, const mavlink_message_t* msg);
 
 private:
+    AP_ADSB(const AP_AHRS &ahrs)
+        : _ahrs(ahrs)
+    {
+        AP_Param::setup_object_defaults(this, var_info);
+    }
 
     // initialize _vehicle_list
     void init();