Backend verifier endpoints
In this merge request, the following is added:
- A GET request to get all students.
- A GET request for all courses that are verifiable.
- A POST request for the verifiers to update the prerequisites of a user with the full [0,1,2] scale.
- A POST request for the verifiers to update verifier ranks for courses with the [0,1,2] scale.
Edited by Otto Visser