Highlight Course Path

We want to eliminate some information displayed so that it is easier for Karsten to conduct planning with students.

This would include

• Clicking a course to unselect it
• Highlighting a selected course
• Highlighting any of the courses that are required to get to a selected course
• Highlighting any courses that stem from the selected course.
• Increasing the transparency of all non-selected, non-required, and non-stem courses

Allowing multiple courses to be selected at once should probably be another issue