Dave Allie d23020e268 OTA updates (#96) ...

## Summary

* Adds support for OTA
  * Gets latest firmware bin from latest GitHub release
* I have noticed it be a little flaky unpacking the JSON and
occasionally failing to start

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..

OtaUpdateActivity.cpp

OTA updates (#96)

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OtaUpdateActivity.h

OTA updates (#96)

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SettingsActivity.cpp

OTA updates (#96)

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SettingsActivity.h

OTA updates (#96)

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