//-----------------------------------------------------------------------------
// Game::UnLoadContent()
// unload content (resources loaded above)
// unload all content that was loaded before the Engine Loop started
//-----------------------------------------------------------------------------
public override void UnLoadContent()
{
FontManager.Destroy();
GlyphManager.Destroy();
CollisionPairManager.Destroy();
SpriteAnimationManager.Destroy();
SpriteBoxManager.Destroy();
SpriteManager.Destroy();
ImageManager.Destroy();
TextureManager.Destroy();
}