This primarily means pre-calculating the list of things we'll be looping over
and then returning matches from this list. Make the regex match be more generic
rather than sorta-kinda-user-id-like-ish.
RoomView is the parent component which creates MessageComposer AND the status
bar. By making RoomView instantiate TabComplete we can scope instances
correctly rather than relying on singleton behaviour through dispatches. This
also makes communication between status bar and the MessageComposer infinitely
easier since they are now sharing the same TabComplete object.
Moved to a `TabComplete` class. Make it more generic (list of strings rather
than RoomMembers) and sort the member list by last_active_ago. Everything still
seems to work.
