SITL: added SIM_ODOM_ENABLE

for enabling visual odomotry simulated data

libraries/SITL/SITL.cpp

@@ -92,6 +92,7 @@ const AP_Param::GroupInfo SITL::var_info[] = {
     AP_GROUPINFO("GP2_GLITCH",    59, SITL,  gps2_glitch,  0),
     AP_GROUPINFO("ENGINE_FAIL",   60, SITL,  engine_fail,  0),
     AP_GROUPINFO("GPS2_TYPE",     61, SITL,  gps2_type,  SITL::GPS_TYPE_UBLOX),
+    AP_GROUPINFO("ODOM_ENABLE",   62, SITL,  odom_enable, 0),
     AP_GROUPEND
 };
 

libraries/SITL/SITL.h

@@ -115,7 +115,8 @@ public:
     AP_Int8  terrain_enable; // enable using terrain for height
     AP_Int8  pin_mask; // for GPIO emulation
     AP_Float speedup; // simulation speedup
-
+    AP_Int8  odom_enable; // enable visual odomotry data
+    
     // wind control
     float wind_speed_active;
     float wind_direction_active;