internal bool CanGCostBeLowerThanCurrent(int delta, NewNode neighbour)
 {
     if ((neighbour.GCost + delta) < GCost)
     {
         return(true);
     }
     return(false);
 }
 internal void AssignDelta(int delta, NewNode node)
 {
     GCost = delta + node.GCost;
     FCost = HCost + GCost;
 }