Using String#codePointAt()?

[ashi009]

I noticed that the code converts utf8 to utf16 manually, however String#codePointAt() is already standardized for quite a while.

I think switch to use the built in version should give unidecode a huge performance boost.

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[FGRibreau]

Hello @ashi009,

Indeed, I will accept a PR for it if the tests pass!