New port: x11-fonts/tamzen

Tamzen is a monospace bitmap font forked from Scott Fial's
Tamsyn version 1.11 with additional Powerline symbols

WWW: https://github.com/sunaku/tamzen-font

PR: 233892
Submitted by: voidanix@420blaze.it
Differential Revision: https://reviews.freebsd.org/D18451