Intervention model refactoring

* splits Intervention model into three main components
   * Intervention (main object)
   * LegalData (holds legal dates, laws, etc.)
   * ResponsibilityData (holds organizations and handler)
   * This way data can be extended more easily in the future
* refactors admin.py and usages in templates
* introduces UuidModel as a base class for BaseResource

intervention/models.py

@@ -12,33 +12,61 @@ from django.utils import timezone
 from django.utils.timezone import now
 
 from intervention.settings import INTERVENTION_IDENTIFIER_LENGTH, INTERVENTION_IDENTIFIER_TEMPLATE
-from konova.models import BaseObject, Geometry
+from konova.models import BaseObject, Geometry, UuidModel
 from konova.utils.generators import generate_random_string
 from organisation.models import Organisation
 from user.models import UserActionLogEntry
 
 
+class ResponsibilityData(UuidModel):
+    """
+    Holds intervention data about responsible organizations and their file numbers for this case
+
+    """
+    registration_office = models.ForeignKey(Organisation, on_delete=models.SET_NULL, null=True, related_name="+")
+    registration_file_number = models.CharField(max_length=1000, blank=True, null=True)
+    conservation_office = models.ForeignKey(Organisation, on_delete=models.SET_NULL, null=True, related_name="+")
+    conservation_file_number = models.CharField(max_length=1000, blank=True, null=True)
+    handler = models.CharField(max_length=500, null=True, blank=True, help_text="Refers to 'Eingriffsverursacher'")
+
+
+class LegalData(UuidModel):
+    """
+    Holds intervention legal data such as important dates, laws or responsible handler
+    """
+    # Refers to "zugelassen am"
+    registration_date = models.DateField(null=True, blank=True, help_text="Refers to 'Zugelassen am'")
+
+    # Refers to "Bestandskraft am"
+    binding_date = models.DateField(null=True, blank=True, help_text="Refers to 'Bestandskraft am'")
+
+    process_type = models.CharField(max_length=500, null=True, blank=True)
+    law = models.CharField(max_length=500, null=True, blank=True)
+
+
 class Intervention(BaseObject):
     """
     Interventions are e.g. construction sites where nature used to be.
     """
-    registration_office = models.ForeignKey(Organisation, on_delete=models.SET_NULL, null=True, related_name="+")
-    registration_file_number = models.CharField(max_length=1000, blank=True, null=True)
-    conservation_office = models.ForeignKey(Organisation, on_delete=models.SET_NULL, null=True, related_name="+")
-    conservation_file_number = models.CharField(max_length=1000, blank=True, null=True)
-
-    process_type = models.CharField(max_length=500, null=True, blank=True)
-    law = models.CharField(max_length=500, null=True, blank=True)
-    handler = models.CharField(max_length=500, null=True, blank=True, help_text="Who is responsible for this intervention?")
+    responsible = models.OneToOneField(
+        ResponsibilityData,
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name='+',
+        help_text="Holds data on responsible organizations ('Zulassungsbehörde', 'Eintragungsstelle')"
+    )
+    legal = models.OneToOneField(
+        LegalData,
+        on_delete=models.SET_NULL,
+        null=True,
+        blank=True,
+        related_name='+',
+        help_text="Holds data on legal dates or law"
+    )
     geometry = models.ForeignKey(Geometry, null=True, blank=True, on_delete=models.SET_NULL)
     documents = models.ManyToManyField("konova.Document", blank=True)
 
-    # Refers to "zugelassen am"
-    registration_date = models.DateField(null=True, blank=True)
-
-    # Refers to "Bestandskraft am"
-    binding_on = models.DateField(null=True, blank=True)
-
     # Checks - Refers to "Genehmigen" but optional
     checked = models.OneToOneField(
         UserActionLogEntry,