SITL: Added HIL message used by simulator
SITL: Added HIL message used by simulator

The simulator uses this messgage to get incoming data from
jMAVSim that it publishes as sensor data that is consumed by the
sensors module.

Signed-off-by: Mark Charlebois <f1891e7fc976ae1bd489627e2954fb730751d728@gmail.com>

dagar/Firmware,acfloria/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,dagar/Firmware,mcgill-robotics/Firmware,darknight-007/Firmware,mcgill-robotics/Firmware,PX4/Firmware,acfloria/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,jlecoeur/Firmware,PX4/Firmware,acfloria/Firmware,jlecoeur/Firmware,PX4/Firmware,darknight-007/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mcgill-robotics/Firmware,dagar/Firmware,mcgill-robotics/Firmware,dagar/Firmware,darknight-007/Firmware,mcgill-robotics/Firmware,mcgill-robotics/Firmware,jlecoeur/Firmware,krbeverx/Firmware,PX4/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,Aerotenna/Firmware,krbeverx/Firmware,Aerotenna/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,dagar/Firmware,darknight-007/Firmware,acfloria/Firmware,darknight-007/Firmware,jlecoeur/Firmware,krbeverx/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,PX4/Firmware,krbeverx/Firmware,acfloria/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,acfloria/Firmware,dagar/Firmware,jlecoeur/Firmware,Aerotenna/Firmware,jlecoeur/Firmware,krbeverx/Firmware