Resolve "Consecutive slot filling mode"

What does this mr do?

Screenshots

Mode: 100/0. As seen in this SS, once the slot starts the next one opens:

After the first slot completely closes (current time passes closing time), the next one opens up:

Mode: 50/0. Next slot opens once a given slot is pseudo full, (threshold is 50%) in this case.

Both preceding slots are pseudo-full, and therefore the 3rd slot opens.

Mode: 100/2. If the second parameter is not 0, it basically acts as a sliding window

After a few people enque it looks like this:

Note that if the last slot in the sliding window is full, it still works as intended

UI Information

Note to Reviewers

I am open to suggestions on how to phrase the parameters for the end-users. Currently it is horrible.

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #575 (closed)