[simulation] Check behaviour of drag & drop and launch file

[EnricoMingo]

I added the possibility to load the robot in simulation both with drag & drop and launch file. I need a test to check if the behavior is the same and a check for the pid gains which I put so that the drag & drop version is stable. I am quite sure that the gains for both cases will be different since in the launch file version is loaded a world with lower simulation rate.