Move status variable updates out of statemachine

[kymckay]

Some unit status variables are being updated directly in statemachine transition functions (exiting cardiac arrest resets heart rate, entering death sets it to 0), we should move these into event handlers in either the status or vitals component (whichever is more appropriate).

[kymckay]

I'm doing this at the moment and actually think it makes the most sense to just call functions in the status component directly (since statemachine is dependent on it).