Migrations + Cleanup

* adds needed migrations
* refactors forms.py (700+ lines) in main konova app
    * splits into forms/ and forms/modals and single class/topic-files for better maintainability and overview
* fixes bug in main konova app migration which could occur if a certain compensation migration did not run before

ema/migrations/0005_ema_resubmission.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.1.3 on 2022-08-15 06:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('konova', '0014_resubmission'),
+        ('ema', '0004_ema_is_pik'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='ema',
+            name='resubmission',
+            field=models.ManyToManyField(blank=True, null=True, related_name='_ema_resubmission_+', to='konova.Resubmission'),
+        ),
+    ]

ema/migrations/0006_auto_20220815_0803.py

@@ -0,0 +1,23 @@
+# Generated by Django 3.1.3 on 2022-08-15 06:03
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('konova', '0014_resubmission'),
+        ('ema', '0005_ema_resubmission'),
+    ]
+
+    operations = [
+        migrations.RemoveField(
+            model_name='ema',
+            name='resubmission',
+        ),
+        migrations.AddField(
+            model_name='ema',
+            name='resubmissions',
+            field=models.ManyToManyField(blank=True, null=True, related_name='_ema_resubmissions_+', to='konova.Resubmission'),
+        ),
+    ]

ema/migrations/0007_auto_20220815_1030.py

@@ -0,0 +1,19 @@
+# Generated by Django 3.1.3 on 2022-08-15 08:30
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('konova', '0014_resubmission'),
+        ('ema', '0006_auto_20220815_0803'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='ema',
+            name='resubmissions',
+            field=models.ManyToManyField(blank=True, related_name='_ema_resubmissions_+', to='konova.Resubmission'),
+        ),
+    ]