Set Timeslot Item Capacity

For each room in a designated timeslot we should be able to set a "schedule item / session " capacity number to avoid double booking a room during a specific timeslot. It would also be nice to make the timeslot disappear once an item has reached its "session capacity" to avoid double booking.

Right now I can schedule multiple sessions in the same room during the same timeslot. As the Conference Adminsitrator I should be able to set that limit. I would also like to make the case for setting this to one item per room the "default" setting as I think most use cases would agree.