RADAR-base/radar-commons-android: radar-commons-android version 1.0.0 alpha.1

Rewrite of the radar-commons-android to Kotlin. This release merges all plugins under active development into a single repository. External plugins are still allowed, but not maintained as part of this repository. Notable architecture updates: RadarConfiguration is now an interface and is accessed via RadarApplication RadarService immediately binds to AuthService, allowing authentication token updates in the background Current configuration and authentication status is checked in a SplashActivity, simplifying the logic of the MainActivity and LoginActivity. Android Handler use is wrapped inside a SafeHandler to avoid concurrency issues with stopped and restarting handlers. References to device are renamed to source. Source registration is now explicit, and includes the possibility for having multiple sources of the same source type for a participan