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Replace `chicken` in the random maps folder with `startingAnimal`.

Description

Replace chicken in the random maps folder with startingAnimal.

Which is more generic. It means we don't have chicken = oPeacock and the like anymore.
It adds a default scaling function such that people replacing the animals are puzzled by the different number of starting animals./To keep the amount of food roughly equal to the amount standard provide by chicken.

Patch by: @marder
Differential revision: https://code.wildfiregames.com/D4472
Comments by: @smiley, @Stan