Fix MQTT client configuration and add image analysis improvements

- Updated MQTT client to use MQTTv5 without deprecated `clean_session` to resolve ValueError.
- Fine-tuned color thresholds for better dayglo detection accuracy.
- Added cropping to focus analysis on the central area of the image for improved rating calculation.
- Provided command-line option for analyzing specific images, enabling debugging and fine-tuning.

dayglo_detector/dayglo_detector.py

@@ -131,7 +131,7 @@ if len(sys.argv) > 1:
         print(f"File not found: {image_file}")
 
 # Set up MQTT client for normal operation
-client = mqtt.Client(client_id='', clean_session=True, protocol=mqtt.MQTTv5)
+client = mqtt.Client(protocol=mqtt.MQTTv5)
 client.username_pw_set(MQTT_USERNAME, MQTT_PASSWORD)
 client.on_connect = on_connect
 client.on_message = on_message