Handle dashboard shutdown on unexpected contactor state

[zuhaakh]

summary:

• make dashboard go to SHUTDOWN when contactor state doesn't match expected HV running state
• Display "unexpected contactor state" when a contactor mismatch causes shutdown
• clear shutdown reason when dashboard resets

[ManushPatell]

bool positive_closed = (contactors->Pack_Positive_Feedback() == 0);
bool negative_closed = (contactors->Pack_Negative_Feedback() == 0);
bool precharge_open = (contactors->Pack_Precharge_Feedback() == 1);

is a little more readable

[ManushPatell]

This is my fault actually. I want you to readjust the conditions. Check out the PR for #600, theres a hv_shutdown condition thats sent to the dashboard that should be our condition to enter shutdown mode or not. Additionally, hv_shutdown condition comes from 1 -> 0, that means front controller has determined the accumulator states to be IDLE, so we can continue the dash state to enable precharge.

[ManushPatell]

I just pushed that signal, so pull on your side and try to use that now