Extending the Hover Feature for Finals

[adcockdalton]

Summary

Since we've been diversifying the information available about finals, I decided to generalize the functionality of the hover feature.

• Modified HoveredStore.ts to have separate data fields for calendarized finals, calendarized courses, and raw ScheduleCourse data
• Correspondingly updated the variable names in courseRenderPane and sectionTableBody to decentralize it from "courses" to events in general
• Cleaned up the logic in CalendarRoot for incorporating the hovered courses, and added finals to the logic
• Changed the date view to override any selected finals week to the week of the hovered final

I also made an extremely small one line refactor in TermData for consistency's sake since it is related to this PR and was discussed.

Test Plan

• Attempt hover on courses as well as finals for an arbitrary course on an empty schedule
• Attempt hover on both after adding a course
• Attempt hover on both after adding a course from a different, non-default quarter
• Attempt hover on both after adding a course from a different but default quarter

Future Followup

Is there a reason hover to preview is still an experimental toggle feature?

[adcockdalton]

Apologies for the delay, I seem to have forgot that we didn't merge this one yet. Made the slight change. LGTM!