showStatsAsOfAction(action, actionEventType) {
    this.showATK(action, actionEventType);
    this.showHP(action, actionEventType);

    if (!this._showing) {
      this._showing = true;
      if (CONFIG.alwaysShowStats) {
        this.fadeTo(CONFIG.FADE_FAST_DURATION, 255);
      } else {
        this.setVisible(true);
      }
    }
  }
Shows stats at action index, or current values if no action provided.
@param {SDK.Action} [action=null]
@param {String} [actionEventType=EVENTS.update_cache_action] action event type to show