Consecutive slot filling mode

Sometimes we only want students to book slots consecutively. For example, some labs we have 20 people in the first 4 slots and 20 in the last 4, and no one in between. For things like midterm review sessions or even some labs we want to enforce that all slots are fully booked with no gaps.

I believe this should be doable to add as a feature that can be enabled for a slotted session. It would e.g. limit slot selection to the first slot which has capacity left.

• Slots can conditionally become open when previous slots are filled
• This condition can be modified (e.g. what % is a slot has to be full in order for the consecutive slot to open and how many previous slots can be empty)