New themeable components (Chat Header & No Chats View), bug fixes
Added: New themeable component, Chat Header - customize the chat header with the new HTML & CSS template.
Added: New themeable component, No Chats view - customize the messaging and layout of the view when there aren't any chats with the new HTML & CSS template.
Added: Autofocus the message field on desktop devices, new option to toggle this behaviour with messageField.autofocus
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Fixed: When a user has been removed from a conversation, it will no longer be reported as unread when new messages come in.