Add a function to count the number of characters in a UTF8 string
Add a function to count the number of characters in a UTF8 string

This is useful when converting from utf8 to wide_t for space allocation

zsx/r3,zsx/r3,Pointillistic/rebol-lang,zsx/r3,Pointillistic/rebol-lang,zsx/r3,Pointillistic/rebol-lang,Pointillistic/rebol-lang