add support for next function: DAYS, ISFORMULA, RRI, DMIN, DMAX, DAVERAGE, DSTDEV, DSTDEVP, DCOUNT, DCOUNTA, DGET, DPRODUCT, VAR, VARP, DSUM, BITAND, BITOR, BITXOR, BITLSHIFT, BITRSHIFT, MAXIFS, MINIFS, TEXTJOIN, BESSELJ, BESSELK, BESSELY, BESSELI, NETWORKSDAYS.INTL, WORKDAY.INTL, SWITCH, ISOWEEKNUM, AGGREGATE, BINOM.DIST.RANGE, ECMA.CEILING, SHEET, SHEETS, UNICODE