fix repl freezing when typing C-<arrows> #4
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I made some changes to solve the problem of repl freezing when typing Ctrl-right/left arrow. I'm used to these key bindings in emacs and muscle memory makes linedit unusable for me, since the terminal suddenly becomes unresponsive.
I bound C-right to forward-sexp and C-left to backward-sexp.
I also added the clear-screen (screen refresh as in emacs) command (bound to C-l)
and new-sexp (bound to M-N)