Various upgrades & fixes

• Fix type checking in unit tests (was not running prior to this) (#70 (closed))
• Add unit tests for Python 3.10 & 3.11 (#71 (closed))
• Update syntax that is deprecated in Python 3.10+
• Allow customizing MQTT startup / connection behavior (#39 (closed))
• Avoid crash on malformed IPMI output (#67 (closed))
• Use new device classes in rtl_433 (#72 (closed))

Closes #39 (closed), #67 (closed), #70 (closed), #72 (closed)