Implement simple steering of the worm model

[slarson]

Eduardo Izquierdo is interested in adding steering into the model. This would involve modifying the input function driving the muscles.

Can we have some discussion around exactly what changes to the code we would need to implement to do this?

@edizquie @a-palyanov @skhayrulin

[a-palyanov]

Hi guys! Sure we can discuss this! By the way, what kind of steering? Signals from simulated neurons or signals like those sinusoids in the code but more complex or something another?