Updated to new audio system

It's more educational to go through new material system, so, I decide to
remove this function to avoid students confusion...

Simplified to match raylib installer package folder structure

Most of this code was developed by students, it requires some additional
review to be used for teaching.

This game was developed for King GameJam 2015

Those games have been developed by students and ported to a common base
template. Some of them still require some review to be consistent with
each other (formatting, variables naming, code structure...)

...to avoid .mem file creation