|SOURCE|
[Common::Renderer::MaterialManager]
* Changed the ZED::Renderer::Material parameter in AddMaterial to be a pointer
  const reference
[Common::Renderer::Renderer]
* Added AddMaterial which invokes the material manager's AddMaterial member
  function
* Added GetMaterial to get a material by its ID, which calls the material
  manager's GetMaterial member function
* Added GetMaterial to get a material by its name, using the underlying
  material manager's GetMaterial member function
[Linux::Renderer::LinuxRendererOGL3]
* Added a ZED::Renderer::MaterialManager to preside over the material access
  and input funcitons