`each_` and `eachline_`

[Isaac Elliott]

array.each_ : Array a -> (a -> IO ()) -> IO ()

cmd.eachline_ : Cmd -> (String -> IO ()) -> IO ()

cmd.eachline_ command func should be equivalent to io.andThen (cmd.lines command) (\lines -> array.each_ lines f), but avoids reading the entirety of stdin into an array.