Add a lock for latest_smokedetector_messages
Add a lock for latest_smokedetector_messages

Hopefully will prevent our EOFErrors from occurring

Charcoal-SE/SmokeDetector,ArtOfCode-/SmokeDetector,ArtOfCode-/SmokeDetector,Charcoal-SE/SmokeDetector,NickVolynkin/SmokeDetector,NickVolynkin/SmokeDetector