Integrate django-scopes (#1319)

* Install django-scopes

* Fix tests.api

* Update tasks and cronjobs

* Fix remaining tests

* Remove unused import

* Fix tests after rebase

* Disable scopes for get_Events_with_any_permission

* Disable scopes for a management command

src/pretix/base/models/event.py

@@ -17,6 +17,7 @@ from django.utils.crypto import get_random_string
 from django.utils.functional import cached_property
 from django.utils.timezone import make_aware, now
 from django.utils.translation import ugettext_lazy as _
+from django_scopes import ScopedManager
 from i18nfield.fields import I18nCharField, I18nTextField
 
 from pretix.base.models.base import LoggedModel
@@ -336,6 +337,8 @@ class Event(EventMixin, LoggedModel):
         default=False
     )
 
+    objects = ScopedManager(organizer='organizer')
+
     class Meta:
         verbose_name = _("Event")
         verbose_name_plural = _("Events")
@@ -875,6 +878,8 @@ class SubEvent(EventMixin, LoggedModel):
     items = models.ManyToManyField('Item', through='SubEventItem')
     variations = models.ManyToManyField('ItemVariation', through='SubEventItemVariation')
 
+    objects = ScopedManager(organizer='event__organizer')
+
     class Meta:
         verbose_name = _("Date in event series")
         verbose_name_plural = _("Dates in event series")