Design basic API structure to handle interacting with in game objects

[mysticfall]

We need a common API to handle interactions with in-game objects, like opening a door or picking up an object.

For starters, it might be possible to generalize the existing IHighlightable and IInteratable API so that it can also be used with 3D game objects.

We can use them to implement a prototype interaction API that tracks nearby objects in camera viewport and hightlight them and show proper labels.