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[Common::Renderer::Material]
* Added Get and Set member functions for the following:
  * Diffuse colour - Defines the overall colour to apply to a polygon
  * Ambient colour - A constant global colour value
  * Specular colour - The light reflected back from when the surface is lit
  * Specular power - The amount of specular highlighting to apply (higher
    values are smaller while larger ones create a more diffuse highlight)
  * Shadow receiver - Whether or not this material receives shadows
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[Common::Renderer::Material]
* Default constructor sets the newly added colour, specular power, and shadow
  receiver variables to default values