New ports, graphics/cbonsai: Bonsai tree generator

Bonsai tree generator, written in C using ncurses. It intelligently
creates, colors, and positions a bonsai tree, and is configurable.

WWW: https://gitlab.com/jallbrit/cbonsai

PR: 252412
Submitted by: Lewis Cook <vulcan@wired.sh> (maintainer)
Reviewed by: daniel.engberg.lists@pyret.net