Cree un etat du programme

Cela consiste a crée une classe qui reçois des informations sur l’état du ray tracer en temps réel. On devra sans doute faire un pattern listener / observer pattern. (avec une interface)

No files, tests, or entry points are named. Begin by locating where the ray tracer state is produced, then determine the information the new class must receive in real time and how a listener/observer interface fits; done means that state can be delivered through the agreed interface.

Written by the indexing model from the issue text.