Optionally disable twitter

twitter.py

@@ -18,6 +18,9 @@ class TwitterClient:
         logger.info(f"Logged in to twitter as '{self.api.me().name}")
 
     def handle_observation(self, observation, observation_data, waterfall_image, data_images, tweet_waterfall = False):
+        global enabled
+        if not enabled:
+            return
         with tempfile.TemporaryFile() as tmp:
             tmp.write(data_images[0])
             text = f"New satellite image from {observation_data['satellite_name']} at {observation_data['data_timeframe_start']} UTC. {observation_data['url']} #cccamp19"