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/presale/templates/pretixpresale/base.html

@@ -34,7 +34,8 @@
     {% endcompress %}
     <meta name="referrer" content="origin">
     {{ html_head|safe }}
-    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1.0, user-scalable=0">
+    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=0">
+    <link rel="icon" href="{% static "pretixbase/img/favicon.ico" %}">
     {% block custom_header %}{% endblock %}
     <link rel="shortcut icon" href="{% static "pretixbase/img/favicon.ico" %}">
     <link rel="apple-touch-icon" sizes="180x180" href="{% static "pretixbase/img/icons/apple-touch-icon.png" %}">