add map back to Functor

[Carter Schonwald]

harkening back to the old Haskell 1.5 days, Lets have map back in functor.
it "F"-  strange to not have our lovely maps be functorial by default.

I think it would be a genuine boon for old and new haskellers alike, and
those who disagree with this change already use alt-preludes for pedagogy
reasons anyways
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