Feature suggestion: Add an overdue jobs section

[joehorsnell]

Currently, there are three main sections in Que web - running, scheduled and failing.

If you have jobs enqueued in the future (eg run_at: 1.day.from_now) it makes it harder to see jobs that are overdue/waiting to run (eg because of a backlog in the workers) because they are in the same bucket (in Que web) as jobs that we don't really care about yet.

It would be very handy to split out those jobs that can/should run immediately (ie run_at <= now() from those that are scheduled for some time later.

PS. Thanks for you efforts in making this useful Que add-on.

[ZimbiX]

Other additional categories would probably be useful as well. @homestars have added a few in their fork which could be worth pulling in: