add a copyright header to source files

src/c/Camera.cpp

src/c/Camera.h

src/c/Defines.h

src/c/Globals.h

src/c/GraphicObject.cpp

src/c/GraphicObject.h

src/c/Initialization.cpp

src/c/Initialization.h

src/c/Material.cpp

src/c/Material.h

src/c/MeshPrimitive.cpp

src/c/MeshPrimitive.h

src/c/MessageProcessor.cpp

src/c/MessageProcessor.h

src/c/MessageQueue.cpp

src/c/MessageQueue.h

src/c/Renderer.cpp

src/c/Renderer.h

src/c/RendererPackage.h

src/c/SceneNode.cpp