misc/wmforecast: New port, version 1.4

Wmforecast, a weather dockapp for Window Maker, displays
current temperature and current conditions. Forecast via
balloon tooltip.

Changelog: https://github.com/d-torrance/wmforecast/blob/master/ChangeLog

PR: 252811
Submitted by: Igor Pokrovsky <ip@unixway.org> (new maintainer)
Approved by: arrowd (mentor)
Differential Revision: https://reviews.freebsd.org/D28239