Fix #978 -- Allow to split names (#1049)

- [x] attendee names
- [x] Invoice address names
- [x] Data migration
- [x] API serializers
  - [x] orderposition
  - [x] cartposition
  - [x] invoiceaddress
  - [x] checkinlistposition
- [x] position API search
- [x] invoice API search
- [x] business/individual required toggle
- [x] Split columns in CSV exports
- [x] ticket editor
- [x] shredder
- [x] ticket/invoice sample data
- [x] order search
- [x] Handle changed naming scheme
- [x] tests
- [x] make use in:
  - [x] Boabee
  - [x] Certificate download order
  - [x] Badge download order
  - [x] Ticket download order
- [x] Document new MySQL requirement
- [x] Plugins

src/pretix/control/views/event.py

@@ -644,7 +644,7 @@ class MailSettingsRendererPreview(MailSettingsPreview):
                                                     expires=now(), code="PREVIEW", total=119)
                 item = request.event.items.create(name=ugettext("Sample product"), default_price=42.23,
                                                   description=ugettext("Sample product description"))
-                order.positions.create(item=item, attendee_name=ugettext("John Doe"), price=item.default_price)
+                order.positions.create(item=item, attendee_name_parts={'full_name': ugettext("John Doe")}, price=item.default_price)
                 v = renderers[request.GET.get('renderer')].render(
                     v,
                     str(request.event.settings.mail_text_signature),