/// <summary>
/// Saves the sector state to a memento.
/// </summary>
/// <returns>The memento of the current sector state.</returns>
public SerializableSector SaveToMemento()
{
return(new SerializableSector
{
unit = unit?.SaveToMemento(),
landmark = landmark?.SaveToMemento(),
ownerId = owner?.Id ?? -1,
PVC = pvc
});
}