Implement notifications for admin users (#700)

* First stab at notification settings

* Add "global" setting for notification levels

* Trigger notification task

* Get users with permission for event

* Actually send notification emails

* More notifications

* Allow to turn off notifications

* Link in email to pause all notifications

* Add NotificationType to wordlist

* Add notification tests

* Add documentation

* Rebase fixes

src/tests/base/test_permissions.py

@@ -23,6 +23,11 @@ def user():
     return User.objects.create_user('dummy@dummy.dummy', 'dummy')
 
 
+@pytest.fixture
+def admin():
+    return User.objects.create_user('admin@dummy.dummy', 'dummy', is_superuser=True)
+
+
 @pytest.mark.django_db
 def test_invalid_permission(event, user):
     team = Team.objects.create(organizer=event.organizer)
@@ -204,7 +209,7 @@ def test_superuser(event, user):
 
 
 @pytest.mark.django_db
-def test_list_of_events(event, user):
+def test_list_of_events(event, user, admin):
     orga2 = Organizer.objects.create(slug='d2', name='d2')
     event2 = Event.objects.create(
         organizer=event.organizer, name='Dummy', slug='dummy2',
@@ -223,7 +228,7 @@ def test_list_of_events(event, user):
 
     team1 = Team.objects.create(organizer=event.organizer, can_change_orders=True, all_events=True)
     team2 = Team.objects.create(organizer=event.organizer, can_change_vouchers=True)
-    team3 = Team.objects.create(organizer=event.organizer, can_change_event_settings=True)
+    team3 = Team.objects.create(organizer=orga2, can_change_event_settings=True)
     team1.members.add(user)
     team2.members.add(user)
     team3.members.add(user)
@@ -235,3 +240,20 @@ def test_list_of_events(event, user):
     assert event2 in events
     assert event3 in events
     assert event4 not in events
+
+    events = list(user.get_events_with_permission('can_change_event_settings'))
+    assert event not in events
+    assert event2 not in events
+    assert event3 in events
+    assert event4 not in events
+
+    assert set(event.get_users_with_any_permission()) == {user, admin}
+    assert set(event2.get_users_with_any_permission()) == {user, admin}
+    assert set(event3.get_users_with_any_permission()) == {user, admin}
+    assert set(event4.get_users_with_any_permission()) == {admin}
+
+    assert set(event.get_users_with_permission('can_change_event_settings')) == {admin}
+    assert set(event2.get_users_with_permission('can_change_event_settings')) == {admin}
+    assert set(event3.get_users_with_permission('can_change_event_settings')) == {user, admin}
+    assert set(event4.get_users_with_permission('can_change_event_settings')) == {admin}
+    assert set(event.get_users_with_permission('can_change_orders')) == {admin, user}