Added uLightColor component
Added lights to diffuse
Made diffuse equations similar to phong

The PhongMaterial has the correct equations for ambient and diffuse. I
translated them to DiffuseMaterial.
Updated Diffuse and Toon

Put "intensity" back into Diffuse and passed light color into
ToonMaterial. Still needs more testing with RajawaliExamples
Removed duplicate multiplication

Intensity was being multipied twice, this commit repairs that.
Fixed typos in DiffuseMaterial

"intenstiy" was spelled incorrectly in one case, and I also removed a
trailing ")".

Fully tested with Rajawali examples.
Updated PhongMaterial

Phong was not working properly with "use color". The float var
"intensity" has been added to capture LightPower, and is multiplied with
Kd within the sahder now.
Updated Bumpmap materials with uLightColor

Extended light color support to bumpmap materials
Updated equation for Kd

Intensity is once again an independent variable. I have multiplied
uLightColor(i) with the equivalent of intensity(i) to derive Kd which is
added to itself on each loop iteration. Kd * textureColor (or vertx
color) then completes the color calculation.
Reduced number of calculation