Cold drinks!

[Rivet-the-Zombie]

This PR gives minifriges the ability to chill certain foods (primarily
beverages) and give them the (cold) flag which improves their morale
boost by 50% - or gives them a small morale boost if they have a
negative morale value.
The cold flag wears off with time (about an hour out of the fridge) and
is tied to a new comestible flag ("EATEN_COLD") with all the relevant
morale calculations taken care of in player.cpp.

[Valkjosandi]

Can I suggest a moral penalty for cold foods like pizza, steak, and other things commonly eaten hot, or is that out if the scope of this pr?

Edit: corrected spelling of 'steak'

[Rivet-the-Zombie]

That's a bit more than what I'm doing with this PR.

I'll file the idea away for later, though.

[Valkjosandi]

Okay :) One more question, does the "it.fridge " condition refer strictly to the mini fridge or do fridges found in houses work too?

[Rivet-the-Zombie]

Just powered minifridges that have been turned on.