dropStudent: A dropStudent method removes a Student from the Course. method header: public boolean dropStudent(Student student) if the student is not on the roster or waitlist, the student cannot be dropped if the student is on the waitlist, remove the student from the waitlist if the student is on the roster, remove the student from the roster since there is now one more space in the class, if the waitlist is not empty, take the first student off the waitlist and add them to the roster; then remove that student from the waitlist (and then shift everyone else up in their waitlist position) return true or false based on whether the student is dropped or not if a student is dropped from either the roster or the waitlist, the method should return true