ludus. Implement game engine on pause/resume.

Add ad control field and access to ingenium.
Implement the game engine on pause/resume - call ingenium ad control to on pause/resume.
game_engine. Change ad control constructor and methods access to public.
game_engine. Call the engine on pause/resume when the view on pause/resume is called.

This change also includes a fix to the on pause native interface - only pass the engine handle.