[CM] Support Unicode in S7 engine

[Elijah Stone]

I think unicode support would be neat.  That said, for a text editor, you may 
want to use a structure such as a rope, rather than using native strings.

On Sat, 17 Dec 2022, jingkaimori wrote:

> Hello all,
>    I am developing a text editor, which use s7 as its script engine.
> This editor will handle cjk texts and emojis, so scheme script for
> this editor should recognize utf-8 string literal and handle 32-bit
> char type. I would like to improve s7 and backport change to original.
> Are there some suggestions for me?
> jingkaimori
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