ESV demo split into levels

Michal Antkiewiczrequested to merge
esv_demo_split into master

Simulation

slaunch esv_demo 1 1 --gss-sim # variable speed adult pedestrian from behind E5
slaunch esv_demo 2 1 --gss-sim # constant speed child pedestrian from behind poles

Mixed reality

slaunch esv_demo 1 0 --gss-sim --mixed-reality # variable speed adult pedestrian from behind E5
slaunch esv_demo 2 0 --gss-sim --mixed-reality # constant speed child pedestrian from behind poles

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