Game subsystem

The Game subsystem defines the characteristics of an asteroid-shooting game:

The actors --asteroids, bullets, and a spaceship--are game-specific derivations of the Universe subsystem's TAbstractActor.
Derived classes of the Collision subsystem's TCollisionBehavior allow for custom interactions (exploding and bouncing off the boundaries of the game space).
TSimulationLevel creates the universe, populates it with actors, and tells it to initiate the program's threads. TSimulationLevel also has ongoing roles in updating the view with refresh information and routing keypresses from the view to actors.

The TSimulationLevel instance is responsible for starting and stopping the simulation in an orderly fashion and saving the simulation's state.

The derived class of TAbstractActor, TExplodingActor, provides additional protocol that is used by TExplosionBehavior for actors that explode. The TExplosionBehavior class represents the behavior between actors that explode when they collide.

Boundaries of the simulation are represented by the TBoundingBoxBehavior class. When an actor attempts to go outside the defined boundaries, the TBoundingBoxBehavior moves it back into the simulation.

The TShip class represents the user control space ship in the simulation. It is one of several concrete derived classes of TExplodingActor.

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