add stub sync methods and isChildOf helper method

freecad/kiconnect/bases/BaseObject.py

@@ -27,6 +27,16 @@ class BaseObject:
 
         return None
 
+    def isChildOf(self, parent):
+        p = self.feature
+
+        while p:
+            if p == parent:
+                return True
+            p = p.getParent()
+
+        return False
+
     def onBeforeChange(self, feature, prop):
         pass
 
@@ -44,5 +54,11 @@ class BaseObject:
     def setup_properties(self, feature):
         feature.addProperty('App::PropertyString', 'Type', 'KiConnect', 'Internatl KiConnect Type', read_only=True, hidden=True)
 
+    def sync_from(self):
+        pass
+
+    def sync_to(self):
+        pass
+
     def __getstate__(self):
         return None