docs: function mixinGameMetadata(game) {
      if (!game.metadata) game.metadata = {};
      if (!game.metadata.name) game.metadata.name = this.game.info.name;
      if (!game.metadata.description) {
          game.metadata.description = this.game.info.description;
      }
      if (!game.metadata.version) game.metadata.version = this.game.info.version;
  }