Azat Akhmetyanov

Add gravity, rotation vector, GPS

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Closes #57

Synchronized multi-device video recording

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Global task - integration of ```libsoftwaresync``` method into OpenCamera Sensors 1. Investigate the possibility of **video recording** with this method (as oppposed to synchronized snapshots)

- Use a reliable way of reporting smartphone hostname when connecting remote recording control (so if, for instance, USB tethering is used instead of Wi-Fi, the hostname gets reported accordingly)

- ````testTakeVideoSettings``` relies on the synchronous recording stop and sets a short wait time. - Some other tests not included in instrumentation might have been affected too.

Currently, all the scripts are in one travis job

- [ ] Make sure current frame saving setup is enough not to cause frame rate drop / buffer allocation problems on devices other than already tested

Move strings with TODOs to resources

Display and collect smartphone properties

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- Add menu with important smartphone properties (sensor timestamp source, sensor support) - Create an option to collect them and organize this data into a useful table of models and...

- Could be based on Twist-n-Sync - GUI for method selection