User list for group chats

[MirceaKitsune]

It would be very helpful if group chats had an user list to the right showing all people in that group with full info (avatar, username, status message, away status). Discord, Telegram, even IRC follow this trend: Groups are hard to decipher without it and you can't properly tell who's there with you. Later on this will be where to add support for things like roles and user actions, for starters though just being able to properly see who's in the group and online would be a great improvement.