Refs #39 -- New concept of "teams" (#478)

* New models

* CRUD UI

* UI for adding/removing team members

* Log display for teams

* Fix invitations, move frontend

* Drop old models (incomplete)

* Drop more old stuff

* Drop even more old stuff

* Fix tests

* Fix permission test

* flake8 fix

* Add tests fore the new code

* Rebase migrations

src/tests/control/test_waitinglist.py

@@ -2,8 +2,7 @@ import pytest
 from django.utils.timezone import now
 
 from pretix.base.models import (
-    Event, EventPermission, Item, Organizer, Quota, User, Voucher,
-    WaitingListEntry,
+    Event, Item, Organizer, Quota, Team, User, Voucher, WaitingListEntry,
 )
 from pretix.control.views.dashboards import waitinglist_widgets
 
@@ -34,12 +33,9 @@ def env():
         event=event, item=item2, email='item2@example.org'
     )
 
-    EventPermission.objects.create(
-        event=event,
-        user=user,
-        can_view_orders=True,
-        can_change_orders=True
-    )
+    t = Team.objects.create(organizer=o, can_view_orders=True, can_change_orders=True)
+    t.members.add(user)
+    t.limit_events.add(event)
     return event, user, o, item1