Message Thread Improvements

The new separation of message threads is a very cool feature but I've already seen an annoyance of the individual threads ballooning the navigation on a singular discord server.

So I propose the following:
Collapsible threads (much like categories), allow a collapse of a channel so that threads are not visibile, but if a notification is there provide that same familiar red dot.

On the red dot/notifications, make the DEFAULT of notifications for threads to be OFF (or the same as what it is for the server channel or server parent for the USER.)

Otherwise, good work, looks to be very cool so far.