Allow admins to manually add students to the Interested Students table in Minor Management

[bledsoef]

Allow an admin to add an interested student to the Interested Students section on that page. I think we can reuse the functionality of the Add Volunteers modal in Manage Volunteers.

[bledsoef]

Add additional functionality to minor admin page

[bledsoef]

Have an "Email All Interested" button on the CCE Minor Management page