/// <summary>
 /// Reduces the number of turns remaining. Removes the effect from the Hexagon if nbTurn inferior to 1.
 /// </summary>
 /// <param name="hexagon">The Hexagon affected by the effect.</param>
 public void ReduceNbTurn(Hexagon hexagon)
 {
     _nbTurn--;
     if(_nbTurn < 1)
     {
         hexagon.RemoveOnTimeEffect(this);
     }
 }