games/loderunner-ng: New port

A classic Lode Runner game remake heavily based on LodeRunner_TotalRecall
implementation by Simon Hung. Original Lode Runner game is developed by
Doug Smith and published by Broderbund in 1983.

Reviewed by: diizzy,olevole_olevole.ru,dch
Approved by: dch
Differential Revision: https://reviews.freebsd.org/D51631