Hy client lacks eval#raw_out option

[velbel]

It would be nice to have the option to choose to disable ; (out) preceding all stdout lines in the Hy client.

This would be beneficial to having a more legible log. It would also permit the syntax highlighter to style output differently than comments, whose own styling might be intentionally more discreet than other elements.

The Clojure nrepl client already includes this feature as a settable option.