fix(core): Serializer _urls.notes URL generation now dynamic

ref: #662 #665

app/core/lib/feature_not_used.py

@@ -0,0 +1,13 @@
+
+
+class FeatureNotUsed:
+    """Type used to denote that a feature is not enabled"""
+
+    def __bool__(self):
+
+        return False
+
+
+    def __list__(self):
+
+        return False