Isolated agent related code into individual class
Implemented SimpleEnvironment as an individual scene
Added better looking floor
Added a light source to the scene
Dummy AppState to monitor egocentric context data
Better isolation of app constructs
Implemented "Inventory" feature for agent

* pick up / drop down feature--> still buggy, needs improvements
* Temporarily ignored a second scenario due to large assets data
Implemented a notification manager

* also added objet type information and info on weather an object can
or cannot be moved
Only consider data carrying  EgocentricContextData