WIP: Coroutines

Open Andreas Schildbach requested to merge coroutines into master

This MR shows how to use Kotlin coroutines for a much more readable code. When reviewing this, it's recommended to look at the changes in UpdateClockJob.kt.

I will continue on this once the card10 Bluetooth has reasonably matured (i.e. compatible to my Pixel 2).

Edited by Andreas Schildbach

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