implement some prettyping-inspired display alongside textual data.



this is a first stab at porting "prettyping.sh" into noping. the idea is to show a histogram of the ping history.

it is a little rough for now:

 * it should fallback when the terminal is not unicode-capable

 * the scaling logic is not fully automatic, which will degenerate (ie. all red or all green) in cases where the latency is close to 255 ms or 1ms with little stddev

this requires switching to the ncursesw library and other unicode ncurses hackery described in this post:

http://newsgroups.derkeiler.com/Archive/Rec/rec.games.roguelike.development/2010-09/msg00050.html

pretty ping is a awk/bash script, MIT-licensed, available here:

https://bitbucket.org/denilsonsa/small_scripts/src/tip/prettyping.sh