Support for solving Golf using bh-solver.

See https://github.com/shlomif/black-hole-solitaire and
https://www.shlomifish.org/open-source/projects/black-hole-solitaire-solver/
.

Reviewers: #kde_games

Subscribers: kde-games-devel

Differential Revision: https://phabricator.kde.org/D18566