Move auto check-in to plugin with more functionality (#4331)

* Move auto check-in to plugin with more functionality

* Rename field

* Add to MANIFEST.in

src/pretix/base/models/checkin.py

@@ -102,9 +102,9 @@ class CheckinList(LoggedModel):
     auto_checkin_sales_channels = models.ManyToManyField(
         "SalesChannel",
         verbose_name=_('Sales channels to automatically check in'),
-        help_text=_('All items on this check-in list will be automatically marked as checked-in when purchased through '
-                    'any of the selected sales channels. This option can be useful when tickets sold at the box office '
-                    'are not checked again before entry and should be considered validated directly upon purchase.'),
+        help_text=_('This option is deprecated and will be removed in the next months. As a replacement, our new plugin '
+                    '"Auto check-in" can be used. When we remove this option, we will automatically migrate your event '
+                    'to use the new plugin.'),
         blank=True,
     )
     rules = models.JSONField(default=dict, blank=True)

src/pretix/base/services/checkin.py

@@ -1154,7 +1154,7 @@ def perform_checkin(op: OrderPosition, clist: CheckinList, given_answers: dict,
             )
 
 
-@receiver(order_placed, dispatch_uid="autocheckin_order_placed")
+@receiver(order_placed, dispatch_uid="legacy_autocheckin_order_placed")
 def order_placed(sender, **kwargs):
     order = kwargs['order']
     event = sender
@@ -1171,7 +1171,7 @@ def order_placed(sender, **kwargs):
                     checkin_created.send(event, checkin=ci)
 
 
-@receiver(periodic_task, dispatch_uid="autocheckin_exit_all")
+@receiver(periodic_task, dispatch_uid="autocheckout_exit_all")
 @scopes_disabled()
 def process_exit_all(sender, **kwargs):
     qs = CheckinList.objects.filter(