Introduce view for room import from CSV

This implements #156 (closed)

AKModel/forms.py

+import csv
+import io
+
 from bootstrap_datepicker_plus import DateTimePickerInput
 from django import forms
 from django.forms.utils import ErrorList
@@ -61,8 +64,10 @@ class NewEventWizardImportForm(forms.Form):
                  renderer=None):
         super().__init__(data, files, auto_id, prefix, initial, error_class, label_suffix, empty_permitted, field_order,
                          use_required_attribute, renderer)
-        self.fields["import_categories"].queryset = self.fields["import_categories"].queryset.filter(event=self.initial["import_event"])
-        self.fields["import_requirements"].queryset = self.fields["import_requirements"].queryset.filter(event=self.initial["import_event"])
+        self.fields["import_categories"].queryset = self.fields["import_categories"].queryset.filter(
+            event=self.initial["import_event"])
+        self.fields["import_requirements"].queryset = self.fields["import_requirements"].queryset.filter(
+            event=self.initial["import_event"])
 
 
 class NewEventWizardActivateForm(forms.ModelForm):