Function is_noble_zone

plugins/preserve-rooms.cpp:287–290

//

static bool is_noble_zone(int32_t zone_id, const string & code) {
    auto it = noble_zones.find(zone_id);
    return it != noble_zones.end() && it->second[0] == code;
}

static int32_t get_spouse_hfid(color_ostream &out, df::historical_figure *hf) {
    for (auto link : hf->histfig_links) {