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- Check that member modifying the group is in the group themselves. It is not allowed to readd yourself to the group or remove someone without being in the group themselves. - Unify code for group member addition and removal. Removing a member now recreates the group member list from the To: field. Removed member from the Chat-Group-Member-Removed was in the To: field in previous Delta Chat versions, so it is excluded explicity. New versions of Delta Chat put removed member in Bcc: instead. - Apply avatar changes after updating the group member list. This allows to check that the contact modifying the avatar is actually a group member.