Feature/melody

[BlueAndi]

Supports playing melodies like on the target with the Pololu Buzzer class.

[nhjschulz]

I suggest adding the march as an easter egg, like playing it only whenn A-Butten is pressed at power-on. Otherwise it will likely be too annoying forcing everyone to turn it off again.

[BlueAndi]

I suggest adding the march as an easter egg, like playing it only whenn A-Butten is pressed at power-on. Otherwise it will likely be too annoying forcing everyone to turn it off again.

At the moment it depends on the application, but yes, we can trigger it by button. Lets consider this in the next PR.