New add application usecase, improved add_classification usecase and better defaults for owner settings. Thanks johltn

src/ifcopenshell-python/ifcopenshell/api/owner/settings.py

@@ -1,10 +1,13 @@
+# Note: it is the intent for you to override these with your own functions
+
+
 def get_person(ifc):
-    pass
+    return ifc.by_type("IfcPerson")[0]
 
 
 def get_organisation(ifc):
-    pass
+    return ifc.by_type("IfcOrganization")[0]
 
 
 def get_application(ifc):
-    pass
+    return ifc.by_type("IfcApplication")[0]