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/settings.py

@@ -261,7 +261,8 @@ REST_FRAMEWORK = {
 CORE_MODULES = {
     "pretix.base",
     "pretix.presale",
-    "pretix.control"
+    "pretix.control",
+    "pretix.plugins.checkinlists",
 }
 
 MIDDLEWARE = [