Hopefully fixed lockup bug.

pymumble_py3/callbacks.py

@@ -81,6 +81,7 @@ class CallBacks(dict):
             for func in self[callback]:
                 if callback is PYMUMBLE_CLBK_TEXTMESSAGERECEIVED:
                     thr = threading.Thread(target=func, args=pos_parameters)
+                    thr.daemon = True  # Fix critical memory leak - ensure thread cleanup
                     thr.start()
                 else:
                     func(*pos_parameters)