They were disabled because they failed to build,
but this patch set fixes the build on Linux and macOS.

This doesn't apply to the AppVeyor build on Windows yet;
it currently fails at linking with OpenAL.

Now it works! :)

Some people might find this handly

Now works in WEB!

- Removed raylib_demo (outdated)
- Removed some old examples

Related to UpdateMusicStream(), in stb_vorbis

Detected a VERY weird code behaviour... :(

Render wave in a render target
Implemented combo system
Removed big useless audio (fxWave)

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...)