Add option to ignore the SMTP server's certificate

New smtp_allow_insecure config option that, when enabled, makes the mailer
skip TLS certificate verification, allowing SMTP servers with self-signe

Add option to ignore the SMTP server's certificate

New smtp_allow_insecure config option that, when enabled, makes the mailer
skip TLS certificate verification, allowing SMTP servers with self-signed or
otherwise untrusted certificates to be used (issue #32).

The integration test now also covers STARTTLS against a self-signed
certificate, and the pretest hook starts Mailpit with a generated cert so
that test can run.

Closes #32

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Add Mailpit based SMTP integration test

Delivers a real mail through the plugin to a Mailpit server and verifies
delivery (From/To/Cc, envelope Bcc and body) via the Mailpit HTTP API.

The test only

Add Mailpit based SMTP integration test

Delivers a real mail through the plugin to a Mailpit server and verifies
delivery (From/To/Cc, envelope Bcc and body) via the Mailpit HTTP API.

The test only runs when MAILPIT_HOST is set, otherwise it is skipped so
the regular test suite is unaffected. In CI a _test/pretest.sh hook starts
Mailpit and exports the connection details, so the test runs as part of the
normal plugin_smtp group without a separate workflow job.

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Switch from bundled subtrees to Composer dependencies

Replace the git-subtree vendored copies of txthinking/mailer and
psr/log with Composer-managed dependencies under vendor/, loaded
automatically

Switch from bundled subtrees to Composer dependencies

Replace the git-subtree vendored copies of txthinking/mailer and
psr/log with Composer-managed dependencies under vendor/, loaded
automatically by DokuWiki's plugin autoloader. The custom PSR-4
loader.php is no longer needed and has been removed.

Also modernize the plugin to current DokuWiki conventions:
- namespaced base classes, short array syntax, PSR code style
- rebuild the admin test form with dokuwiki\Form\Form
- key recipients by address in Message::getTo() so RCPT TO works
with the mailer's key-based iteration
- guard the Bcc continuation loop against running past the body
- avoid an undefined-key warning in getEHLO() on CLI sends
- migrate tests to the *Test.php naming and test namespace
- replace Travis with the shared DokuWiki GitHub Action

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make test compatible with DW test suite

fixed tests

better recipient handling

wizard generated initial checkin