addMatch(actionConfig, handler) {
    if (this._includesMatcherForCombination(actionConfig.id)) {
      const { keyEventType, actionName, id } = actionConfig;
      this._addHandlerToActionConfig(id, { keyEventType, actionName, handler });
    } else {
      this._addNewActionConfig(actionConfig, handler);
    }
  }
Adds a new ActionConfiguration and handler to those that can be used to match a
KeyCombination
@param {ActionConfiguration} actionConfig
@param {Function} handler Function to call if match is selected
@returns {void}