game_engine. Add ad control to game engine.

Add ad control - uses local broadcast manager to enable disable ads in the game activity.
Game activity creates and holds an ad control when it is created.
Change game engine activity interface to give access to the ad control - replaces access to the local broadcast manager.
Change game engine create native interface to get an ad control object.
ludus. Rename platform to ad control.
game_engine. Add on pause/resume interface to game engine.

The pause resume interface in the java engine calls the native engine on pause/resume.
The current native implementation for on pause/resume is empty.
Remove the ad control argument from create native engine.
The on pause/resume will be used to pass the java ad control to the native ad control.