Second public beta of Thunderbird for Android 8.0, based on K-9 Mail. Changes include:

- Import accounts from Desktop via QR codes
- Removed folder display classes
- Always show all folders in the Manage Folders screen
- Fixed top crash when removing accounts
- Properly aligned welcome text
- Updated support link to support.mozilla.org
- Accessibility fixes
- Temporarily removed telemetry

More details: https://github.com/thunderbird/thunderbird-android/releases/tag/THUNDERBIRD_8_0b2