Thunderbird Beta for Testers

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Thunderbird for Android version 9.0b1, based on K-9 Mail. Changes include:
- Account initials now use the display name, improving customizability
- Account icons remain in the same position when selected
- Unified inbox enabled only when multiple accounts are configured
- Push service now starts reliably when expected
- Correct default delete message action for QR-imported accounts. Please check your fetch mail settings!
- Folder drawer updates properly on account configuration changes