/// <summary>
 /// Checks if node is part of <see cref="AllNeighbors"/>, by identifier.
 /// </summary>
 /// <param name="identifier">Node identifier.</param>
 public void CheckIfPartOfAllNeighborsByIdentifier(string identifier)
 {
     if (AllNeighbors.Find(x => x.Identifier == identifier) == null)
     {
         throw new System.ArgumentException("Node not found among AllNeighbors field.");
     }
 }
    /// <summary>
    /// Adds connection to node with <paramref name="identifier"/> in <see cref="ConnectedNeighbors"/>.
    /// </summary>
    /// <param name="identifier">Neighboring node identifier.</param>
    public void AddConnectionByIdentifier(string identifier)
    {
        CheckIfPartOfAllNeighborsByIdentifier(identifier); // if this goes through, connection is appropriate
        MazeNode neighbor = AllNeighbors.Find(x => x.Identifier == identifier);

        AddConnectionByReference(neighbor);
        //if (!ConnectedNeighbors.Contains(neighbor)) { ConnectedNeighbors.Add(neighbor); }
        //if (!neighbor.ConnectedNeighbors.Contains(this)) { neighbor.ConnectedNeighbors.Add(this); }
    }
 /// <summary>
 /// Adds connection to <paramref name="neighbor"/> in <see cref="AllNeighbors"/>.
 /// </summary>
 /// <param name="neighbor">Neighboring node.</param>
 public void AddBaseConnectionByReference(MazeNode neighbor)
 {
     if (AllNeighbors.Find(x => x.Identifier == neighbor.Identifier) == null)
     {
         AllNeighbors.Add(neighbor);
     }
     if (neighbor.AllNeighbors.Find(x => x.Identifier == this.Identifier) == null)
     {
         neighbor.AllNeighbors.Add(this);
     }
 }