Bangle.js Gadgetbridge

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Target Android SDK 31 (allowing us to update for first time since November)
OSMAnd and Google Maps navigation
Fix Bangle.js GPS-over-phone functionality sometimes breaking connection to the Bangle
... Many other Gadgetbridge improvements since 0.71.2 (https://github.com/Freeyourgadget/Gadgetbridge/blob/master/CHANGELOG.md)