moving Tone feature over from firmata/arduino #24
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Copied this over from the firmata/arduino repo and made some updates.
To do:
If duration is optional, make sure noTone() is called during a systemReset
Note: It would be helpful if the call to firmataExt.reset() in the systemResetCall function of ConfigurableFirmata was before the pins are reset to their default modes. This would enable the reset function of any particular feature class to perform any cleanup based on a specific pin mode. For example, ensuring that noTone() is called for any TONE pins. I'm not sure if this has any negative effects yet.