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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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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added default host

copied configs and language strings from the swiftmail plugin

wizard generated initial checkin