Yun constructor
Implementation
Yun(EightChar eightChar, int gender, [int sect = 1]) {
_lunar = eightChar.getLunar();
_gender = gender;
// 阳
bool yang = 0 == _lunar!.getYearGanIndexExact() % 2;
// 男
bool man = 1 == gender;
_forward = (yang && man) || (!yang && !man);
computeStart(sect);
}