Timothy Flynn fd8ccedf2b AK: Add GenericLexer API to consume an escaped Unicode code point ...

This parsing is already duplicated between LibJS and LibRegex, and will
shortly be needed in more places in those libraries. Move it to AK to
prevent further duplication.

This API will consume escaped Unicode code points of the form:
    \\u{code point}
    \\unnnn (where each n is a hexadecimal digit)
    \\unnnn\\unnnn (where the two escaped values are a surrogate pair)

2021-08-19 23:49:25 +02:00

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