[#qGyzXbjp] GeoShapeRelationCalculator.

Part of [this Trello card](https://trello.com/c/qGyzXbjp/303-2-tg-2-geo-as-a-guest-i-will-be-able-to-specify-which-state-region-combination-i-want-to-search-in).

You can find the Polygon referenced here in [the other PR](https://github.com/wimdu/wimdu_geo_graf/pull/1).