[m-rev.] for review: add some unicode support to Mercury

[Michael Day]

> Add the function utf8_length to the string module to determine the number
> of unicode characters in a string.

Might it not be more useful to add this to a separate utf8 module, that
can also include functionality such as utf8_foldl that iterates over
UNICODE codepoints rather than bytes, without having to clutter up the
string module?

Michael

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