george/prediction_tracker: Manage and score predictions on arbitrary topics. @ bc99d85e703c65e4e202522694fcae7566b262bc

George C. Privon 718c0f9d85 fix header		%!s(int64=6) %!d(string=hai) anos
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scoring_rules-test.rkt	718c0f9d85 fix header	%!s(int64=6) %!d(string=hai) anos