public void CancelQuest([NotNull] IQuest quest)
{
if (quest == null) throw new ArgumentNullException(nameof(quest));
var idx = CurrentQuests.FindIndex(q => q == quest);
if (idx < 0) return;
quest.Deactivate();
SaveDataManager.instance.SaveData.currentQuests.Remove(quest);
SaveDataManager.instance.ApplyToFile();
OnQuestCanceled(quest);
}