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/checkin.py

@@ -3,6 +3,7 @@ from django.db.models import Case, Count, F, OuterRef, Q, Subquery, When
 from django.db.models.functions import Coalesce
 from django.utils.timezone import now
 from django.utils.translation import pgettext_lazy, ugettext_lazy as _
+from django_scopes import ScopedManager
 
 from pretix.base.models import LoggedModel
 
@@ -20,6 +21,8 @@ class CheckinList(LoggedModel):
                                                       'order have not been paid. This only works with pretixdesk '
                                                       '0.3.0 or newer or pretixdroid 1.9 or newer.'))
 
+    objects = ScopedManager(organizer='event__organizer')
+
     class Meta:
         ordering = ('subevent__date_from', 'name')
 
@@ -167,6 +170,8 @@ class Checkin(models.Model):
         'pretixbase.CheckinList', related_name='checkins', on_delete=models.PROTECT,
     )
 
+    objects = ScopedManager(organizer='position__order__event__organizer')
+
     class Meta:
         unique_together = (('list', 'position'),)