Cleanded code for simulated roomba -> getting rid of the dependancy on
the roomba structure.
The goal is to prepare a simulator that will get the commands from a
network socket (that will replace the serial connection for the physical
implementation).
Nice to have: web service that can accept svg shapes in order to draw
more things pn the map (estimated roomba position, ...). This will be be
done in the simulator itself (independant from the roomba physical
simulator).