Use new savegame format to store citymania extra data

src/settings_table.cpp

@@ -72,7 +72,9 @@ SettingTable _world_settings{ _world_settings_table };
 #if defined(_WIN32) && !defined(DEDICATED)
 SettingTable _win32_settings{ _win32_settings_table };
 #endif /* _WIN32 */
-
+namespace citymania {
+	SettingTable _settings{ _citymania_settings_table };
+}  // namespace citymania
 
 /* Begin - Callback Functions for the various settings. */