Method product_is_dye

plugins/tailor.cpp:553–562

    using color_type = decltype(MaterialInfo::material->powder_dye);

    static auto product_is_dye (df::reaction_product* r) -> bool
    {
        if (r->getType() == df::reaction_product_type::item)
        {
            auto rr = virtual_cast<df::reaction_product_itemst> (r);
            auto mat = MaterialInfo(rr->mat_type, rr->mat_index);
            return mat.material && mat.material->flags.is_set(df::enums::material_flags::IS_DYE);
        }
        return false;
    };

    oqt order_dye_from_reaction(df::reaction* r, int c = 1)
    {