suggestion - filter class meeting times by no conflicts

[QuillenKai]

It would be helpful in planning distros if I could filter to show classes that meet precisely at times I don't already have classes loaded into the schedule, especially when my unscheduled time isn't necessarily all in one block.

[dilanx]

I like this idea a lot. It would be a good addition to the existing time filter (that only supports a single time block at a time). I'll try to add it in the new version!