Rewritten pub/sub, v20

src/WebSocketContext.h

@@ -249,8 +249,7 @@ private:
                 }
 
                 /* Make sure to unsubscribe from any pub/sub node at exit */
-                webSocketContextData->topicTree.unsubscribeAll(webSocketData->subscriber, false);
-                delete webSocketData->subscriber;
+                webSocketContextData->topicTree.freeSubscriber(webSocketData->subscriber);
                 webSocketData->subscriber = nullptr;
             }