SITL: added SIM_GYR_SCALE_{X,Y,Z}

allows testing of gyro scale factor learning in EKF2

libraries/SITL/SITL.cpp

@@ -75,6 +75,7 @@ const AP_Param::GroupInfo SITL::var_info[] = {
     AP_GROUPINFO("MAG_OFS",       41, SITL,  mag_ofs, 0),
     AP_GROUPINFO("ACC2_RND",      42, SITL,  accel2_noise, 0),
     AP_GROUPINFO("ARSP_FAIL",     43, SITL,  aspd_fail, 0),
+    AP_GROUPINFO("GYR_SCALE",     44, SITL,  gyro_scale, 0),
     AP_GROUPEND
 };
 

libraries/SITL/SITL.h

@@ -63,6 +63,7 @@ public:
     AP_Float baro_drift;  // in metres per second
     AP_Float baro_glitch; // glitch in meters
     AP_Float gyro_noise;  // in degrees/second
+    AP_Vector3f gyro_scale;  // percentage
     AP_Float accel_noise; // in m/s/s
     AP_Float accel2_noise; // in m/s/s
     AP_Vector3f accel_bias; // in m/s/s