FUNCTION DecodeRune : RUNE
Unpacks the first UTF-8 encoding in pbyData and returns the rune and its length in bytes.
If pbyData is empty it returns (c_diRuneError, udiLength=0). Otherwise, if the encoding is invalid, it returns (c_diRuneError, udiLength=1`). Both are impossible results for correct, non-empty UTF-8.
An encoding is invalid if it is incorrect UTF-8, encodes a rune that is out of range, or is not the shortest possible UTF-8 encoding for the value. No other validation is performed.
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