This PR adds the National Ice Cream Day (yeah, it's one of those
'murrican holidays) to the game, bringing a few niche ice-cream-related
effects to the game
During the Ice Cream Day:
- Crematoriums replaced with cre**a**matoriums.
- All cyborgs that don't already come with the treat dispenser are given
(a slightly weaker) one stuck in ice cream mode.
- Robot customers order ice cream thrice as often.
- The ice cream vat starts with two times and a half more ingredients.
- Ice cream cones can hold up to four times as many scoops as normal.
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