Fix #515 -- Add check-in lists (#693)

* Data model and migration

* Some backwards compatibility

* CRUD for checkin lists

* Show and perform checkins

* Correct numbers in table and dashboard widget

* event creation and cloning

* Allow to link specific exports and pass options per query

* Play with the CSV export

* PDF export

* Collapse exports by default

* Improve PDF exporter

* Addon stuff

* Subevent stuff, pretixdroid tests

* pretixdroid tests

* Add CRUD API

* Test compatibility

* Fix test

* DB-independent sorting behavior

* Add CRUD and coyp tests

* Re-enable pretixdroid plugin

* pretixdroid config

* Tests & fixes

src/pretix/base/services/export.py

@@ -1,6 +1,7 @@
 from typing import Any, Dict
 
 from django.core.files.base import ContentFile
+from django.utils.timezone import override
 
 from pretix.base.i18n import language
 from pretix.base.models import CachedFile, Event, cachedfile_name
@@ -13,7 +14,7 @@ from pretix.celery_app import app
 def export(event: str, fileid: str, provider: str, form_data: Dict[str, Any]) -> None:
     event = Event.objects.get(id=event)
     file = CachedFile.objects.get(id=fileid)
-    with language(event.settings.locale):
+    with language(event.settings.locale), override(event.settings.timezone):
         responses = register_data_exporters.send(event)
         for receiver, response in responses:
             ex = response(event)