Integrate full-featured reporting system

[ACRA](https://github.com/ACRA/acra) is too basic and lacks useful features. [Firebase Crashlytics](https://firebase.google.com/docs/crashlytics/) is de-facto standard for modern Android development. Opensource [Matomo](https://matomo.org/) can be considered as an alternative. [AppDynamics](https://www.appdynamics.com/) can be considered, too.