Test program for AccurateWaiter

Dependencies:   SerialStream AccurateWaiter

This test program shows how to use AccurateWaiter and demonstrates its performance.

Here's what it looks like running on a NUCLEO_F429ZI: https://app.box.com/shared/static/a7vuulqeqodh7pn5skgvniwo0b4h3pmj.png

AccurateWaiter.lib/shortlog/shortlog@df183df60d24: not found in manifest