Add Camera position to per frame buffer
Prepare shaders with position of the camera that is sent every frame.
	In Graphics the Camera position is fetched and set to per frame
	buffer. In Shaders the float4 cameraPosition variable is added to
	the per frame struct.
Add Phong Shading
Phong shading implemented in Placeholders shaders. Light calculations
	is now included in the scene.
Merge branch 'development' into PhongShading
Merge pull request #65 from SvinSimpe/PhongShading

Phong shading