Odrivetool serial port interface

It looks like at some point in the past odrivetool used to support --path serial:/dev/ttyUSB0

This seems really useful for 2 immediate reasons:

  1. using the output as a reference for implementing the native protocol
  2. using a single serial port interface to an odrive that lives in an embedded system. A developer may still want to ssh in to the embedded computer, disable the app, and then debug the odrive using odrivetool

Where’d it go? :slightly_frowning_face: