Merge branch 'refactor-views-to-viewsets' into 'master'

backend/core/models.py

backend/core/permissions.py

backend/core/serializers.py

backend/core/tests/data_factories.py

backend/core/tests/test_access_rights.py

backend/core/tests/test_auth.py

backend/core/tests/test_examlist.py

backend/core/tests/test_factory_and_feedback.py

backend/core/tests/test_student_page.py

backend/core/tests/test_student_reviewer_viewset.py

backend/core/tests/test_submissiontypeview.py

backend/core/tests/test_tutor_api_endpoints.py

backend/core/urls.py

backend/core/views.py

backend/grady/settings/default.py

frontend/src/components/Login.vue

frontend/src/components/reviewer/ReviewerPage.vue

frontend/src/components/reviewer/ReviewerToolbar.vue

frontend/src/components/reviewer/StudentListOverview.vue

frontend/src/components/student/StudentNav.vue