Sensor Data Collector

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Changelog
* Bugfix: video/audio recording (permission error)
* Bugfix: exporting/writing to interal/external storage (permission error)
* Bugfix: set correct acceleration frequency (Wearable Device, Android Wear 2.x)
* Bugfix: It was possible that not all data was written into the database if also a wearable device was connected
* Improvement: add support of API-level 26
* minor changes