Compensation forms refactoring

* splits compensation/forms.py and /modalForms.py into individual files inside new packages
    * general forms stay in new files in compensation/forms
    * modal forms stay in new files in compensation/forms/modals

compensation/forms/modals/deadline.py

@@ -0,0 +1,92 @@
+"""
+Author: Michel Peltriaux
+Organization: Struktur- und Genehmigungsdirektion Nord, Rhineland-Palatinate, Germany
+Contact: ksp-servicestelle@sgdnord.rlp.de
+Created on: 18.08.22
+
+"""
+from django import forms
+from django.utils.translation import gettext_lazy as _
+
+from konova.forms.modals import BaseModalForm
+from konova.models import DeadlineType
+from konova.utils.message_templates import DEADLINE_EDITED
+
+
+class NewDeadlineModalForm(BaseModalForm):
+    """ Form handling deadline related input
+
+    """
+    type = forms.ChoiceField(
+        label=_("Deadline Type"),
+        label_suffix="",
+        required=True,
+        help_text=_("Select the deadline type"),
+        choices=DeadlineType.choices,
+        widget=forms.Select(
+            attrs={
+                "class": "form-control"
+            }
+        )
+    )
+    date = forms.DateField(
+        label=_("Date"),
+        label_suffix="",
+        required=True,
+        help_text=_("Select date"),
+        widget=forms.DateInput(
+            attrs={
+                "type": "date",
+                "data-provide": "datepicker",
+                "class": "form-control",
+            },
+            format="%d.%m.%Y"
+        )
+    )
+    comment = forms.CharField(
+        required=False,
+        max_length=200,
+        label=_("Comment"),
+        label_suffix=_(""),
+        help_text=_("Additional comment, maximum {} letters").format(200),
+        widget=forms.Textarea(
+            attrs={
+                "cols": 30,
+                "rows": 5,
+                "class": "form-control",
+            }
+        )
+    )
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.form_title = _("New deadline")
+        self.form_caption = _("Insert data for the new deadline")
+
+    def save(self):
+        deadline = self.instance.add_deadline(self)
+        return deadline
+
+
+class EditDeadlineModalForm(NewDeadlineModalForm):
+    deadline = None
+
+    def __init__(self, *args, **kwargs):
+        self.deadline = kwargs.pop("deadline", None)
+        super().__init__(*args, **kwargs)
+        self.form_title = _("Edit deadline")
+        form_data = {
+            "type": self.deadline.type,
+            "date": str(self.deadline.date),
+            "comment": self.deadline.comment,
+        }
+        self.load_initial_data(form_data)
+
+    def save(self):
+        deadline = self.deadline
+        deadline.type = self.cleaned_data.get("type", None)
+        deadline.date = self.cleaned_data.get("date", None)
+        deadline.comment = self.cleaned_data.get("comment", None)
+        deadline.save()
+        self.instance.mark_as_edited(self.user, self.request, edit_comment=DEADLINE_EDITED)
+        return deadline