Implement moving filter on WatchDog

Currently, our `FakeWatchDog` implementation will instantly freak out if it gets passed a bad SensorData once.

This might sound good, but it's not useful because it will take time for pressure and temperature readings to transition after a state change, so our WatchDog will probably trip every time we change states.

Implement a storage of past SensorDatas in a new WatchDog class, oldest will be replaced by newest so probably a queue. We will then average/use the median of sensor data readings across all SensorDatas in storage, and use that averaged SensorData to run redlines on.