remove(refOrRefList) {

    if (!refOrRefList) {
      return;
    }

    if (typeof refOrRefList === 'string') {
      refOrRefList = [ refOrRefList ];
    }

    for (let i = refOrRefList.length; i--;) {
      const tRef = refOrRefList[i];
      if (this.callbacks[tRef]) {
        this.logger('debug', `Deleting callback for "${tRef}"`);
        delete this.callbacks[tRef];
      }
    }

  }
Removes the callback from the list of tiddler callbacks.