public PersistenceController()
{
String persistencePath = ConfigurationUtil.ReadConfiguration("PersistencePath", "GestorPresupuesto\\Saved.json");
path = Path.Combine(Environment.GetFolderPath(SpecialFolder.MyDocuments), persistencePath);
secondsToSave = ConfigurationUtil.ReadConfigurationAsInt("CacheWriteSeconds", 60);
lastRead = DateTime.MinValue;
cache = ReadFile();
}