Create Infection Object Thingy about pandemic HOT 2 OPEN

@jacoblusk oh it should also have color (I made one in the createCity branch if you want to take that one, otherwise I'll use yours)

from pandemic.

so if we flip it such that each infection object is built with color and [(City, Nat)] or similar, then game_cities should never need to be updated and Infection can just import City

Assuming we're updating cure_status anyways, that would mean that the Infections would be the only ones needing to be updated during play

@jacoblusk @marajxa @adelie any thoughts?

from pandemic.