[CM] Support Unicode in S7 engine

[jingkaimori]

But underlying string of rope is also needed to support Unicode, since
a rope with all character separate is inefficient.

An alternative approach is override native string method with my
already implemented rope handler method, and cast every native string
literal to my rope structure.

Elijah Stone <elronnd at elronnd.net> 于2022年12月18日周日 07:52写道：
>
> 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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