[CM] Support Unicode in S7 engine

[jingkaimori]

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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