- Ambient and lambert lighting added.
- Ambient and diffuse colors linked to standard shader.
- Single light linked to standard shader.
- LoadStandardMaterial() and depending functions added.

...on model drawing

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