Remove AttendeeList view

It could not even filter for attendee and you can do everything (and
better and more) in the OrdersList. And it's one menu entry less to
clutter the interface.

src/pretix/control/views/attendees.py

@@ -1,31 +0,0 @@
-from django.views.generic import ListView
-
-from pretix.base.models import Item, OrderPosition
-from pretix.control.permissions import EventPermissionRequiredMixin
-
-
-class AttendeeList(EventPermissionRequiredMixin, ListView):
-    model = OrderPosition
-    context_object_name = 'attendees'
-    template_name = 'pretixcontrol/attendees/index.html'
-    paginate_by = 30
-    permission = 'can_view_orders'
-
-    def get_queryset(self):
-        qs = OrderPosition.objects.filter(
-            order__event=self.request.event,
-            item__admission=True
-        ).select_related('order')
-        if self.request.GET.get("status", "") != "":
-            s = self.request.GET.get("status", "")
-            qs = qs.filter(order__status=s)
-        if self.request.GET.get("item", "") != "":
-            i = self.request.GET.get("item", "")
-            qs = qs.filter(item_id__in=(i,)).distinct()
-        return qs
-
-    def get_context_data(self, **kwargs):
-        ctx = super().get_context_data(**kwargs)
-        ctx['items'] = Item.objects.filter(event=self.request.event, admission=True)
-        ctx['filtered'] = ("status" in self.request.GET or "item" in self.request.GET)
-        return ctx