Delta Chat

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- fix possibly infinite IMAP loop on some providers introduced in 1.42.3
- fix log in error on some providers as 163.com introduced in 1.42.3
- one-to-one chats guarantee end-to-end encryption for contacts with a green checkmark now
- groups are created automatically with guaranteed end-to-end encryption if possible
- Accept/Blocked, Archived, Pinned, Mute is synced across all your devices
-Improvements in camera, voice, backup-all ...
- Tons of bug fixes