/// <summary>
/// This is called by the GameOver event in the ScoreSprite
/// and AlienSquad if the game is over.
/// </summary>
private void onGameOver()
{
player.Dispose();
aliens.Dispose();
playerLaser.Dispose();
alienBomb.Dispose();
ship.Dispose();
shipBomb.Dispose();
bonus.Dispose();
bonusBomb.Dispose();
Status = GameStatus.OVER;
}
