Quick shutdown of ConsoleHandler thread

lib/CConsoleHandler.h

@@ -94,6 +94,8 @@ private:
 	//function to be called when message is received - string: message, bool: whether call was made from in-game console
 	std::function<void(const std::string &, bool)> cb;
 
+	std::condition_variable shutdownVariable;
+	std::mutex shutdownMutex;
 	std::atomic<bool> shutdownPending = false;
 
 	std::mutex smx;