Invoice addresses: Ask for a state in some countries (#1362)

* Invoice addresses: Ask for a state in some countries

* API, tests, noscript

* Fix shredder tests

* Add test for addresses with long state names

src/pretix/base/migrations/0132_auto_20190808_1253.py

@@ -0,0 +1,27 @@
+# Generated by Django 2.2.1 on 2019-08-08 12:53
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+import pretix.base.models.fields
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('pretixbase', '0131_auto_20190729_1422'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='invoice',
+            name='invoice_to_state',
+            field=models.CharField(max_length=190, null=True),
+        ),
+        migrations.AddField(
+            model_name='invoiceaddress',
+            name='state',
+            field=models.CharField(default='', max_length=255),
+            preserve_default=False,
+        ),
+    ]