[Feature Request] Add more filters

[Andrew-Flanagan]

Would love to have more filter options for Subjects. Particularly would like to see the ability to filter by course year to find upper level electives, and filter for subjects to just show CSC and SENG for example. For summer terms, it would also be useful to have the option to filter by term (e.g. filter for courses being offered that run in the May 9- June 1 semester).