Refactor ownership history system to be simpler and just a usecase. See #1399.

src/ifcopenshell-python/ifcopenshell/api/group/add_group.py

@@ -1,5 +1,5 @@
 import ifcopenshell
-from ifcopenshell.api.owner.api import create_owner_history
+import ifcopenshell.api.owner.create_owner_history as create_owner_history
 
 
 class Usecase:
@@ -12,6 +12,6 @@ class Usecase:
     def execute(self):
         return self.file.create_entity("IfcGroup", **{
             "GlobalId": ifcopenshell.guid.new(),
-            "OwnerHistory": create_owner_history(),
+            "OwnerHistory": create_owner_history.Usecase(self.file).execute(),
             "Name": "Unnamed"
         })