Code name: Configured for Flight

* Please clean data or uninstall the app first when migrating from 0.1.x
* Support multiple accounts
* Notify about incoming email
* Use Firebase Messaging or scheduled background job to periodically check for email
* Show labels in thread view
* Add screen to modify labels for threads
* Add 'Empty Trash' button to trash view
* Add help button (?) when prompting for connection URL

This project has received funding from the European Union’s Horizon 2020 research and innovation programme within the framework of the NGI-POINTER Project funded under grant agreement No 871528.
