Add Teacher Roles

[Schlaumeier5]

Admins should be able to assign roles to teachers, to restrict read/write access to different aspects.
Roles:

• Class Level Management
  • tutor for all classes
• Tutor
  • can change graduation level of a student (in their class)
  • read access to student for all subjects
• one role for each subject
• Tester (read) - all subjects
• Tester (write) - specific subject, but all classes
• Supervisor
  • can see graduation level of students
  • can see current room of students