Avoid bashisms in the call to acme.sh

Closes #6326

See merge request !1595

This command is using features that are not POSIX-compliant (the [[ and
the || in them), that despite being supported by many shells (including
bash) are not available in dash.

Since system() runs the code with /bin/sh that is an interface defined
as only being POSIX-compliant, with no extensions, it should not presume
a specific shell in that.

Closes: #6326
Signed-off-by: Mattia Rizzolo <mattia@mapreri.org>

Resolve "Updated Italian translation (attached)"

Closes #6317

See merge request ispconfig/ispconfig3!1591

Changed 'Client Limit'-check and fixed styling

Closes #6320

See merge request ispconfig/ispconfig3!1593

Resolve "Typo in the ispconfig.vhost - error 400"

Closes #6319

See merge request ispconfig/ispconfig3!1590

Avoid symlink() error if acme conf already exists as a file.

See merge request ispconfig/ispconfig3!1587

Merge branch '6312-fix-compatibility-issues-on-systems-with-php-5-centos-7-systems-2' into 'develop'

Resolve "Fix compatibility issues on systems running php5"

Closes #6312 and #6310

See merge request ispconfig/ispconfig3!1588

Merge branch '6311-add-warning-to-update-script-when-incorrect-php-version-is-used-as-default' into 'develop'

Resolve "Add warning to update script when incorrect PHP version is used as default"

Closes #6311

See merge request ispconfig/ispconfig3!1589

Resolve "Line breaks in ispconfig.log"

Closes #6309

See merge request ispconfig/ispconfig3!1586

remote api permissions for acme proxy

Closes #6307

See merge request ispconfig/ispconfig3!1585

Resolve "Incorrect template name for new AppArmor template"

Closes #6306

See merge request ispconfig/ispconfig3!1583

Add function to configure AppArmor (needed to allow use of /etc/bind for zone files) (#6701)

Closes #6071

See merge request ispconfig/ispconfig3!1582

feat: Add filename/line data to DEBUG messages

Closes #6302

See merge request ispconfig/ispconfig3!1580

Merge branch '6302-slightly-improved-debug-logging' of git.ispconfig.org:GwynethLlewelyn/ispconfig3 into 6302-slightly-improved-debug-logging

There may be no guarantee that `$caller[...]` is actually set, or that
either `file` or `line` are not empty.

Marius Burkard authored Mar 19, 2022 and Gwyneth Llewelyn committed Mar 19, 2022

Good point; I'd even use `!empty($caller['file']) && !empty($caller['line'])` to save a few cycles in the (improbable) case where both _may_ be set, but empty (thus making the whole exercise pointless...).

Resolve "Allow special characters in folder name when using e-mail filter"

Closes #6270

See merge request ispconfig/ispconfig3!1581

Merge branch '6301-delete-ssl-cert-symlinks-in-website-ssl-folder-when-acme-sh-is-used' into 'develop'

Resolve "Delete SSL cert symlinks in website ssl folder when acme.sh is used"

Closes #6301

See merge request ispconfig/ispconfig3!1578

Also, tried to clean up the code formatting according to the guidelines
_and_ added (most) entries for PHPDoc.