UI overhaul

Added new sprites to be used for the ui, but first some explanation:

Added two new files into the mockups to show how the UI looks with
items, and the new lives for both human and werewolf. These are just
mockups, so don't use them in zero.

Secondly, the assets folder has all the new sprites. Every sprite is
new. We need to replace human/werewolf hud, potion sprite, key sprite,
etc…

Lastly, the new hud has a place for lives. There is a heart for each
life number, we can implement it the same way as the potion/key sprites.
There are also assets for cooldown timer/werewolf timer. There is a
sheet with all numbers and then each number separate, depending on how
you want to do it.
-Travis