completed fog example (#18)

* complete fog example
as both fog and basic lighting need the light system it made sense
to seperate it out, there are a few functions from raymath
int rlmath.py

* added shaders custom uniform

* added shaders_texture_waves.py

* added shaders_texture_drawing.py

* bug fix - unwanted transparent effect!

Co-authored-by: codifies <nospam@antispam.com>

examples/shaders/resources/shaders/fogLight.fs

@@ -78,6 +78,7 @@ void main()
     // gamma
     finalColor = pow(finalColor, vec4(1.0/2.2));
 
+
     float dist = length(viewPos - fragPosition) ;
     float fogFactor = 1.0 / exp( (dist * FogDensity) * (dist * FogDensity));
 
@@ -88,4 +89,5 @@ void main()
 
     fogFactor = clamp( fogFactor, 0.0, 1.0 );
     finalColor = mix(fogColor, finalColor, fogFactor);
+
 }