/// <summary>
/// Draws all elements of the game.
/// First the room, then cube manager.
/// Lastly, the screens currently open.
/// </summary>
/// <param name="gameTime"></param>
protected override void Draw(GameTime gameTime)
{
// Draws static room elements.
room.Draw(this);
// Draws dynamic elements.
cubeManager.Draw(this);
// Draws the screens.
screenManager.Draw(this);
base.Draw(gameTime);
}