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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Message: Fix continuation spelling

fixed tests

use CRLF for body. Should fix #17

Fix mistake to send email at several recipients

When I use this plugin to send Notifications at several
recipients, only the first recipient receives the email.

The emails of recipients must not st

Fix mistake to send email at several recipients

When I use this plugin to send Notifications at several
recipients, only the first recipient receives the email.

The emails of recipients must not start or end with space(s)
otherwise the SMTP instruction "RCPT TO:< my@email.com>"
doesn't work.

The list of recipients transmitted to Message class can be
composed of email separated by ", " and not only ",". When
the list of recipients is splitted thanks to delimiter ","
the email can start by space and it must be removed.

Signed-off-by: Sébastien Mennetrier <smennetrier@voxtok.com>

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better recipient handling

some initial simple working state