Method SetSelectedType

src/town_gui.cpp:1525–1525

	int GetSelectedType() const override { return sel_type; }
	void SetSelectedType(int id) const override { sel_type = id; }

	static HouseZone GetHouseZoneFromClassId(int cls_id) { return static_cast<HouseZone>(to_underlying(HouseZone::TownEdge) + cls_id); }
	static int GetClassIdFromHouseZone(HouseZones zones) { return FindFirstBit((zones & HZ_ZONE_ALL).base()) - to_underlying(HouseZone::TownEdge); }