Support line- & column-based match locations

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+.Dd January 15 2024
+.Dt U8GLEN 3
+.Os
+.Sh NAME
+.Nm u8glen
+.Nd count Unicode graphemes
+.Sh LIBRARY
+.Lb librune
+.Sh SYNOPSIS
+.In gbrk.h
+.Ft size_t
+.Fn u8glen "const char8_t *s" "size_t n"
+.Sh DESCRIPTION
+The
+.Fn u8glen
+function returns the number of UTF-8 encoded Unicode graphemes in the
+buffer
+.Fa s
+of length
+.Fa n
+bytes.
+.Pp
+This function assumes that
+.Fa s
+contains only valid UTF-8.
+.Sh RETURN VALUES
+The
+.Fn u8glen
+function returns the number of graphemes in the buffer
+.Fa s .
+.Sh EXAMPLES
+The following call to
+.Fn u8glen
+will return 6 while the call to
+.Fn u8len
+will return 7 as a result of user-preceived characters such as
+.Sq е́
+taking up multiple codepoints.
+.Bd -literal -offset indent
+char8_t s[] = u8\(dqПриве́т\(dq;
+size_t cplen, glen;
+
+cplen = u8len(s, sizeof(s) - 1);
+glen = u8glen(s, sizeof(s) - 1);
+.Ed
+.Sh SEE ALSO
+.Xr u8len 3 ,
+.Xr u8wdth 3 ,
+.Xr unicode 7 ,
+.Xr utf\-8 7
+.Sh STANDARDS
+.Rs
+.%A F. Yergeau
+.%D November 2003
+.%R RFC 3629
+.%T UTF-8, a transformation format of ISO 10646
+.Re
+.Pp
+.Lk https://www.unicode.org/versions/Unicode15.1.0/ \
+"The Unicode\(rg Standard Version 15.1.0"
+.Sh AUTHORS
+.An Thomas Voss Aq Mt mail@thomasvoss.com