Compare human readable key codes with chars literals.
Compare human readable key codes with chars literals.

Many sequences are actually human readable and fall into the printable
ASCII subset, they are a lot more recognizable when written as chars
compared to numbers.

For example up arrow is sent back from the terimal as ESC [A, and so
forth.

This commit makes the code speak the same "language" that you find in
any terminal escape sequences documentation.

hoelzro/linenoise,arnognulf/linenoise,tadzik/linenoise,antirez/linenoise,AresTao/linenoise,howerj/libline,zaxbbun/linenoise,saisai/linenoise,dragontux/linenoise,rlonstein/linenoise,John-Colvin/linenoise,digsrc/linenoise,MoarVM/linenoise,clibs/linenoise