- moved MeshService start-related code to `MeshServiceStarter`
- moved `LocationCallback` to `MeshServiceLocationCallback`
- coroutine scope is now handled in `MeshService` positio ncallback.
- refactored `onLocationResult()` to be easier to read
- created `MeshServiceNotifications` for creating and updating of notifications
- moved `SavedSettings` to `MeshServiceSettingsData`