public Placement([NotNull] TilePlacement tilePlacement, [NotNull] MeeplePlacement meeplePlacement)
 {
     TilePlacement   = tilePlacement;
     MeeplePlacement = Option.Some(meeplePlacement);
 }
 public Placement([NotNull] TilePlacement tilePlacement)
 {
     TilePlacement   = tilePlacement;
     MeeplePlacement = Option.None <MeeplePlacement>();
 }