m1n1.construcutils: Add .clone() method

Signed-off-by: Asahi Lina <lina@asahilina.net>

proxyclient/m1n1/constructutils.py

@@ -579,6 +579,11 @@ class ConstructClass(ConstructClassBase, Container):
     def addrof(self, name):
         return self._addr + self._off[name][0]
 
+    def clone(self):
+        obj = type(self)()
+        obj.update(self)
+        return obj
+
     @classmethod
     def from_json(cls, fd):
         d = json.load(fd)