Unbreakable Mode Introduction will hopefully make feature discovery easier

Hello!

I've added a feature that triggers a monologue from Chara the first time that you die.  The purpose of the monologue is two-fold:

1) To ensure that new players know that unbreakable mode exists. 
I want to make sure new players don't immediately give up if they can't beat the game the first time, so I had Chara appear to explain their options to them.

2) To add some interesting lore to unbreakable mode. 
What even is unbreakable mode?  This monologue is another piece to the puzzle

Still to come: I want to add different endings based on whether you need unbreakable mode to survive the fight.