ref: 3273cfac93bdfcb47aca7b2cfb464347997ac58c
parent: c40d57b389033a42ad526308884e49b39746ecf5
author: phil9 <telephil9@gmail.com>
date: Wed Dec 22 13:17:52 EST 2021
handle function keys (F1-F12) declare sequence to make PLAN9 term recognize function keys