Slay the Zomboss Update 2.1 - Power Ups Update

This new update brings new gameplay mechanic inspired by idea by  yoni post.

+ Added Power Ups
Power-Ups have been added that act like single-use power that you can use whatever you want between battles!
The equivalent of Power-Ups are Potions in original slay the spire!

+ Added Lightning Power-Up (Deals 15 damage to a Zombie)
+ Added Freeze Power-Up (Cancels Attack of a Zombie) 
+ Added Shuffle Power-Up (Discards and redraws your cards)

You can get Power-Ups by three different ways:

1. Through new Unknown Event - Helpful Brewery
2. Through Shop
3. By new Card - Power Lily

New Card - Power Lily
3 cost, gains one random power-up and has dry out

Additionaly tweaked some Zombies added in last update and made other small balances changes!