/// <summary>
/// Initializes static members with SerializeFields.
/// </summary>
void Start()
{
scoreText = scoreHolder.GetComponent <Text>();
leftHitsText = leftHitsHolder.GetComponent <Text>();
rightHitsText = rightHitsHolder.GetComponent <Text>();
EventManager.AddListener(AddScore);
Ball.AddPointsAddedListener(AddScore);
EventManager.AddListener(AddHits);
Paddle.AddHitPaddleListener(AddHits);
}