app store approval, 64-bit updates

* Remove old TestFlightLib, so that this works on 64 bit phones.
* Add concept of frequency and duration to OSMotionProbes
* OSMotionProbes turn on every kMotionSampleFrequency seconds and then stay on  for kMotionSampleDuration seconds
* refactor OSMotionProbe, OSGyroProbe, OSAccelerometerProbe, OSMagnetometerProbe for dryness

* should comply with App Store 13.2:
```
Apps that rapidly drain the device's battery or generate excessive heat will be rejected
```