Update 1.4

Update 1.4 (I'm updating the demo to reflect changes that I've made in the main game...these will be very small, but I want the demo and the full game to be consistent when it comes out)

- Now every undead enemy has the "zombie" status effect on them, which will cause them to take damage with healing skills.

- I've added some early game skills that interact with "zombie" status effect.

- fixed some typos