Migrate to PCRE2?

[drkameleon]

Arturo currently depends on the legacy PCRE library (libpcre.so.3 or libpcre.so.1), which is no longer available in modern Linux distributions (e.g. Debian 13).

Warning

Also: on various other distros, it seems like users have to manually install PCRE. Does it mean that linking against PCRE2 we'd avoid this? (= would have to double-check whether PCRE2 does come already pre-installed in this cases... e.g. Ubuntu, Fedora, etc)

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Also related: #1871