v0.45: Melee sound effects

Added some crunchy punch sounds and swipe sounds. Picks from a random assortment of different sound effects to avoid getting repetitive.

Melee Attack hits harder the longer a zombie is hit during the attack. This means that timing your attack just right is all the more satisfying.

Fixes:

Capped the camera's max zoom out to a lower value. Prevents over-zooming out.