Mini-Mapper 17: Motor board testing

We're now at the point where we can do some reasonably detailed testing of the motor prototype board and the software that goes with it. The code used in this episode is all at the episode-017 tag of the project repository.

In this episode I separately test the electronics on the motor board and the motor board software, then test the two together. The isolated tests are done using features of the Analog Discovery 2.