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/tests/api/test_items.py

@@ -61,7 +61,7 @@ def order_position(item, order, taxrule, variations):
         tax_rate=taxrule.rate,
         tax_value=Decimal("3"),
         price=Decimal("23"),
-        attendee_name="Peter",
+        attendee_name_parts={'full_name': "Peter"},
         secret="z3fsn8jyufm5kpk768q69gkbyr5f4h6w"
     )
     return op