tidy up memory when shutting down our MQTT handler, and on a heavily loaded system, we might miss messages from OpenZWave due to our main thread not being able to respond quick enough to Notification Signals emited by OZW. Make sure we process events after recieving a Notification. Also try/catch blocks fora few places we didn't have before calling into OZW. Should fix a few Sentry reports such as QT-OPENZWAVE-3C and QT-OPENZWAVE-3V
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