public static BlockInfo ConnectTo(this BlockInfo node, [NotNull] NodeInfo to)
 {
     node.PointsTo = to.NotNull();
     return(node);
 }
 public static TActivity ConnectTo <TActivity>(this TActivity node, [NotNull] NodeInfo to)
     where TActivity : ActivityLikeNodeInfo
 {
     node.PointsTo = to.NotNull();
     return(node);
 }