Put sound on PC and Background Music
Put sound on Wanderer, Souls, and fix PC sound

I've add ultratumb sounds to wanderers when you are nearby. The
wanderers have a bite sound when they attack. The souls have sound
aswell if you are near them.
Merge pull request #215 from oriolpujol/DEV-TEAM-B-#208-Sounds

Dev team b #208 sounds