fix(mail): keep '&' intact in mailto links with multiple query params

Move the email-handling helpers (obfuscate, mail_isvalid,
mail_quotedprintable_encode, mail_setup) out of the procedural
inc/mai

fix(mail): keep '&' intact in mailto links with multiple query params

Move the email-handling helpers (obfuscate, mail_isvalid,
mail_quotedprintable_encode, mail_setup) out of the procedural
inc/mail.php into a namespaced dokuwiki\MailUtils class plus a new
Mailer::configInit(), and add a separate MailUtils::obfuscateUrl() for
the mailto-href context.

The xhtml renderer and PluginTrait now build the link label and the
href separately: the address half is run through the mailguard
obfuscation, the query string is preserved verbatim with only HTML
escaping applied. This fixes #1690 — in 'visible' mode the previous
code rawurlencoded the entire address+query, turning '?' into '%3F' and
breaking multi-parameter mailto links; in all modes the query string is
no longer mangled by the [at]/[dot] substitution.

Core call sites (Mailer, auth, LegacyApiCore, common, the xhtml
renderer, the parser, the bundled config/styling/usermanager plugins)
are migrated to MailUtils directly. The old top-level functions and
PREG_PATTERN_VALID_EMAIL constant remain as deprecated shims with
rector mappings.

Tests for obfuscate / mail_isvalid / mail_quotedprintable_encode are
consolidated into a single _test/tests/MailUtilsTest.php and extended
with regression coverage for the multi-parameter, double-escape and
URL-shape cases.

Closes #1690
Replaces #1964

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updated rector and applied it

API: code style fixes

API: move user related tests to usermanager plugin

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations

API: move create/delete user calls to usermanager

This only moves the calls. A proper refactoring of the user manager
would make sense:

1) introduce a helper component covering the basic operations including
proper error signalling using Exceptions
2) refactor admin and cli components to make use of 1)
3) make the operations in 1) available via the API

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