Filter course sessions by campus

[bokbokobama]

Currently, class sessions in international campuses (Croatia, Dubai, etc) are treated the same as Rochester sessions, and are enabled by default. It is possible to filter them out by hand, but it'd be better to have an integrated campus filter. Rochester sessions have a two digit session number (eg ABCD-101-01), while international sessions have a three-digit number (ABCD-101-X01), where X is 5 for Croatia or 6 for Dubai (other numbers may exist).

[jabbate19]

Hello!

I plan to make this a feature when a rewrite is done. Expected over winter break.

[MoralCode]

related: #81