More Hex Tiles

Adds several different kind of Techist hex tiles for all your fancy transhumanist needs.
More materials: Steel, Silver, Gold, Plasteel, Sterile, and Black Iron.
Slightly cheaper, but still very expensive, because they're fancy AF.
Cleanliness slightly better than vanilla metal tiles, with a slight cleaning speed boost to match. Sterile hex tiles are even cleaner.
Removes the old floor from the architect but doesn't delete it, so if you've already built some of the vanilla hex tiles they'll still be there.
Limited to Techist style, but at some point I will make an optional patch mod that removes ideology limitations.
Enjoy. Or don't. I don't care.