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

Revision:
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