UPDATE: Adds minimal generated documented functions (#22)

See #21

wiki/functions.md

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+AND
+FALSE
+IF
+IFERROR
+IFNA
+IFS
+NOT
+OR
+SWITCH
+TRUE
+XOR
+SIN
+COS
+TAN
+ASIN
+ACOS
+ATAN
+SINH
+COSH
+TANH
+ASINH
+ACOSH
+ATANH
+ABS
+PI
+SQRT
+SQRTPI
+ATAN2
+POWER
+MAX
+MIN
+PRODUCT
+RAND
+RANDBETWEEN
+ROUND
+ROUNDDOWN
+ROUNDUP
+SUM
+SUMIF
+SUMIFS
+CHOOSE
+COLUMN
+COLUMNS
+INDEX
+INDIRECT
+HLOOKUP
+LOOKUP
+MATCH
+OFFSET
+ROW
+ROWS
+VLOOKUP
+XLOOKUP
+CONCATENATE
+EXACT
+VALUE
+T
+VALUETOTEXT
+CONCAT
+FIND
+LEFT
+LEN
+LOWER
+MID
+RIGHT
+SEARCH
+TEXT
+TRIM
+UPPER
+ISNUMBER
+ISNONTEXT
+ISTEXT
+ISLOGICAL
+ISBLANK
+ISERR
+ISERROR
+ISNA
+NA
+ISREF
+ISODD
+ISEVEN
+ERROR.TYPE
+ISFORMULA
+TYPE
+SHEET
+AVERAGE
+AVERAGEA
+AVERAGEIF
+AVERAGEIFS
+COUNT
+COUNTA
+COUNTBLANK
+COUNTIF
+COUNTIFS
+MAXIFS
+MINIFS
+YEAR
+DAY
+MONTH
+EOMONTH
+DATE
+EDATE
+TODAY
+NOW
+PMT
+PV
+RATE
+NPER
+FV
+PPMT
+IPMT
+NPV
+MIRR
+IRR
+XIRR
+XNPV
+REPT
+TEXTAFTER
+TEXTBEFORE
+TEXTJOIN
+SUBSTITUTE
+ISPMT
+RRI
+SLN
+SYD
+NOMINAL
+EFFECT
+PDURATION
+TBILLYIELD
+TBILLPRICE
+TBILLEQ
+DOLLARDE
+DOLLARFR
+DDB
+DB
+CUMPRINC
+CUMIPMT
+BESSELI
+BESSELJ
+BESSELK
+BESSELY
+ERF
+ERF.PRECISE
+ERFC
+ERFC.PRECISE
+BIN2DEC
+BIN2HEX
+BIN2OCT
+DEC2BIN
+DEC2HEX
+DEC2OCT
+HEX2BIN
+HEX2DEC
+HEX2OCT
+OCT2BIN
+OCT2DEC
+OCT2HEX
+BITAND
+BITLSHIFT
+BITOR
+BITRSHIFT
+BITXOR
+COMPLEX
+IMABS
+IMAGINARY
+IMARGUMENT
+IMCONJUGATE
+IMCOS
+IMCOSH
+IMCOT
+IMCSC
+IMCSCH
+IMDIV
+IMEXP
+IMLN
+IMLOG10
+IMLOG2
+IMPOWER
+IMPRODUCT
+IMREAL
+IMSEC
+IMSECH
+IMSIN
+IMSINH
+IMSQRT
+IMSUB
+IMSUM
+IMTAN
+CONVERT
+DELTA
+GESTEP
+SUBTOTAL