Write a function to detect apogee

[lwillmeth]

We need some kind of function or loop to detect apogee. Feel free to edit or expand this list of requirements as you go.

• [x] Prevents accidental detection due to air pressure shockwaves
• [x] Able to read from the other sensor objects to get the data it needs

[ASladek]

Added a class with a method for apogee detection, but hasn't been tested with the sensor-reading code b0c2cf691572c0f5628cda377f75e4c42aa649d1

[lwillmeth]

Allison's apogee method converted to a state machine in commit 4cc2ea2e76ac545df89556bb493fc17425537e36.