Created an ambient light and added intensity and color to the light interface
Finetuned the IShader interface.
Created the FlatShader
Created a ShaderComposite class - dont know if it is neccesary or if an object should only have one shader.
Added a focal distance to ICamera
Created a empty constructor for vectors to make it possible to create empty vectors.
Added a backgrondcolor to the scene and created a test setting method in the controller.
project properties