sitl_run.sh handle spaces in paths
sitl_run.sh handle spaces in paths

launch script for jmavsim failed to start if there were any spaces in
paths, string handling in paths was improved and tested.

dagar/Firmware,dagar/Firmware,krbeverx/Firmware,acfloria/Firmware,PX4/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,dagar/Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,krbeverx/Firmware,acfloria/Firmware,mje-nz/PX4-Firmware,PX4/Firmware,dagar/Firmware,Aerotenna/Firmware,krbeverx/Firmware,acfloria/Firmware,Aerotenna/Firmware,PX4/Firmware,krbeverx/Firmware,Aerotenna/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware,dagar/Firmware,Aerotenna/Firmware,acfloria/Firmware,dagar/Firmware,acfloria/Firmware,PX4/Firmware,krbeverx/Firmware,krbeverx/Firmware,Aerotenna/Firmware,acfloria/Firmware,Aerotenna/Firmware,Aerotenna/Firmware,dagar/Firmware,mje-nz/PX4-Firmware,mje-nz/PX4-Firmware,PX4/Firmware