Fix #526 -- Add a webhook system (#1073)

- [x] Data model
- [x] UI
- [x] Fire hooks
- [x] Unit tests
- [x] Display logs
- [x] API to modify hooks
- [x] Documentation
- [x] More hooks!

src/tests/base/test_notifications.py

@@ -78,6 +78,17 @@ def test_notification_trigger_global(event, order, user, monkeypatch_on_commit):
     assert len(djmail.outbox) == 1
 
 
+@pytest.mark.django_db
+def test_notification_trigger_global_wildcard(event, order, user, monkeypatch_on_commit):
+    djmail.outbox = []
+    user.notification_settings.create(
+        method='mail', event=None, action_type='pretix.event.order.changed.*', enabled=True
+    )
+    with transaction.atomic():
+        order.log_action('pretix.event.order.changed.item', {})
+    assert len(djmail.outbox) == 1
+
+
 @pytest.mark.django_db
 def test_notification_enabled_global_ignored_specific(event, order, user, monkeypatch_on_commit):
     djmail.outbox = []