Add an experimental shutdown handler

twitch.py

@@ -121,14 +121,6 @@ class Twitch:
         # perfect for GUI usage
         return partial(self.change_state, state)
 
-    def signal_close(self):
-        """
-        Called when the application is requested to close by the operating system,
-        usually by receiving a SIGINT or SIGTERM.
-        """
-        # delegate this to the same action as the user clicking on the X in the GUI window
-        self.gui.close()
-
     def close(self):
         """
         Called when the application is requested to close by the user,