Restarting level

[wouter-heerwegh]

trafficstars

replaces #348

[wouter-heerwegh]

Still need to add ROS2 changes and then this can get merged

[wouter-heerwegh]

@MattBrth do you also have to wait (sometimes up to 6 or 7 seconds) before data again becomes available from the simulator? Data like lidar, camera,...

[mattbrth]

@wouter-heerwegh Hello, with the python client (without ROS) not at all it's very quick. If you look at the client.py I reset the instance of the client (see restart()) because when calling RestartLevel() it kills the instance of the level and so the rcplib cliend with it. Your problem might come from here.