AC_Attitude_Control: add get_attitude_target_ang_vel

libraries/AC_AttitudeControl/AC_AttitudeControl.h

@@ -210,6 +210,9 @@ public:
     // Return the body-to-NED target attitude used by the quadplane-specific attitude control input methods
     Quaternion get_attitude_target_quat() const { return _attitude_target; }
 
+    // Return the angular velocity of the target (setpoint) [rad/s] in the target attitude frame
+    const Vector3f& get_attitude_target_ang_vel() const { return _ang_vel_target;}
+
     // Return the angle between the target thrust vector and the current thrust vector.
     float get_att_error_angle_deg() const { return degrees(_thrust_error_angle); }