- integration of Androidx navigation component
- replaced obsoleted preferences with Androidx preferences
- replaced png file with svg files
- integration of DayNight theme
- use of live data to have always up-to-date measurements
* replaced RxAndroidBlw with blesses-android library as Bluetooth backend
* remove license commands
* uncomment test debug devices
* use blessed-android library for discovering Bluetooth devices
* add support for Bluetooth Standard Weight Profile scales (e.g. Beurer BF600 and Beurer B850 scales)
* stop scan on Bluetooth discovery
* upgrade Blesses-Android to 0.6