mash-point-light: Implement the point light shader
mash-point-light: Implement the point light shader

This implements the point light shader using the standard Blinn-Phong
shader model. The ambient, diffuse and specular components are all
calculated and attenuation according the attenuation formula.

clutter-project/mash,eliasbakken/mash,eliasbakken/mash,clutter-project/mash,clutter-project/mash