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/base/test_invoices.py

@@ -121,7 +121,10 @@ def test_address_vat_id(env):
     event, order = env
     event.settings.set('invoice_language', 'en')
     InvoiceAddress.objects.create(company='Acme Company', street='221B Baker Street',
-                                  name='Sherlock Holmes', zipcode='12345', city='London', country_old='UK',
+                                  name_parts={'full_name': 'Sherlock Holmes', '_scheme': 'full'},
+                                  zipcode='12345',
+                                  city='London',
+                                  country_old='UK',
                                   country='', vat_id='UK1234567', order=order)
     inv = generate_invoice(order)
     assert inv.invoice_to == "Acme Company\nSherlock Holmes\n221B Baker Street\n12345 London\nUK\nVAT-ID: UK1234567"