Automatic Closing of OH queue

[GMGilson]

Proposal:

Have an optional argument to /open to specify a time.

This time should specify when we should check to see if we should close the queue.
This function should follow something along the lines:

1. Wait until the specified time
2. Check to see if any of the voice channels have anyone with the Instructor role and if the queue is still open.
3. If no Instructors are in voice, close the queue and clear it.
4. Otherwise leave the queue open and repeat.

Issues:

• This implies that instructors always leave their voice room when done with office hours. (I have anecdotal evidence that some TA's DO NOT do this)