Insulation Changes: Cold resistant fire suits

Gives fire suits a bit of extra cold protection over normal armor.

I set it to 60, so you can't use fire suits like the ghetto space suits of old (which would be impossible to emulate now, turns out back then coldness did only negligible damage) but it is enough for atmos techs to clean up a medbay cryo leak, and they will protect long enough for the ballsy atmos tech to plug a hullbreach, or gives an unlucky engineer about a minute thirty to wire a solar array.