Material glossiness is a float type value...

Improved materials

Only works when raylib is installed on windows system.

_g naming convention for globals, new error exit numbers.

Keep asking myself why I maintain this rendering path... -___-

now it works

Not tested yet

Depending on mesh data, it can be loaded and default vertex attribute
location points are set, including colors, tangents and texcoords2

- Renamed some functions for consistency (default buffers)
- Removed mystrdup() function (implemented inline)
- Renamed TextFileRead() to ReadTextFile()

Now floating point is either on or off. This simplifies the use of 16bit
vs float.

updateAudioContext is almost done

Ease of use considered in api and channels are more convenient as
unsigned char type.