Feature: Callouts

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A Callout is a user-defined function that can be evaluated while matching.

Engines

Engine	Supported
Perl	✔
PCRE	✔
Boost.Regex	❌
.NET	❌
Oniguruma	✔
Hyperscan	❌
ICU	❌
Glib/GRegex	❌
ECMAScript	❌