New port: textproc/up: Ultimate plumber, a tool for writing pipes with instant live preview

up is the Ultimate Plumber, a tool for writing Linux pipes in a
terminal-based UI interactively, with instant live preview of command
results.

The main goal of the Ultimate Plumber is to help interactively and
incrementally explore textual data in Linux, by making it easier to quickly
build complex pipelines, thanks to a fast feedback loop. This is achieved
by boosting any typical Linux text-processing utils such as grep, sort,
cut, paste, awk, wc, perl, etc., etc., by providing a quick, interactive,
scrollable preview of their results.

WWW: https://github.com/akavel/up

Reviewed by: mat
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D19716