enable easy dumps/loads on BaseObject via .save_keys

freecad/kiconnect/bases/BaseObject.py

@@ -2,6 +2,8 @@ class BaseObject:
     EXTENSIONS = []
     TYPE = None
 
+    save_keys = []
+
     def __init__(self, feature):
         self.feature = feature
 
@@ -62,5 +64,21 @@ class BaseObject:
     def sync_to(self):
         pass
 
-    def __getstate__(self):
+    def dumps(self):
-        return None
+        data = [ getattr(self, 'TYPE') ]
+
+        if len(self.save_keys) > 0:
+            for key in self.save_keys:
+                try:
+                    data.append(getattr(self, key))
+                except Exception as e:
+                    #XXX logging
+                    print(e)
+
+        return tuple(data)
+
+    def loads(self, state):
+        self.Type = state[0]
+
+        for idx, key in enumerate(self.save_keys):
+            setattr(self, key, state[idx + 1])