Thunderbird version 17.0b1

New:
- Account avatar customization
- Foldable device support
- Email messages can be printed
- Unified folder account indicator
- Display account avatar in message notifications
- Improved email rendering enabled for beta

Fixed:
- Deleted/read messages in unified inbox may not update until refresh
- Tap behavior was unreliable in recipient fields
- Device orientiation change duplicated recipient field text
