getSetting(key) {
        if (key === "NR_GROUP_NAME") {
            return this.name;
        }
        if (key === "NR_GROUP_ID") {
            return this.id;
        }
        if (!key.startsWith("$parent.")) {
            if (this._env.hasOwnProperty(key)) {
                return (this._env[key] && Object.hasOwn(this._env[key], 'value') && this._env[key].__clone__) ? clone(this._env[key].value) : this._env[key]
            }
        } else {
            key = key.substring(8);
        }
        return this.parent.getSetting(key);
    }
Get a group setting value.
@param  {[type]} key [description]
@return {[type]}     [description]