Movement, buildings, and sound.

AI now have a script dedicated to movement with public variables. Player
can now enter and exit both buildings in demo. Player movement is more
refined in that it knows if an object is there and stores the object
data until it goes away, but any other objects will persist. Music has
been added to the house interior. The uDoGz crew can now be found within
the world. TODO: Start/pause button && choices.