Resolve "deleting spamfilter_users should delete linked spamfilter_wblist"

Closes #6199

See merge request ispconfig/ispconfig3!1499

Resolve "Improve session security"

Closes #6179

See merge request ispconfig/ispconfig3!1488

Resolve "git-develop in ispconfig_update.sh not working"

Closes #6175

See merge request ispconfig/ispconfig3!1487

Resolve "Don't use password-protected keys for self-signed certificates"

Closes #6176

See merge request ispconfig/ispconfig3!1486

Resolve "Reverse search order for certbot and letsencrypt binary"

Closes #6172

See merge request ispconfig/ispconfig3!1485

Resolve "AWstats links"

Closes #6147

See merge request ispconfig/ispconfig3!1470

fixes #6084

Closes #6084

See merge request ispconfig/ispconfig3!1425

rspamd: fix remove-headers

See merge request ispconfig/ispconfig3!1483

Resolve "Update readme.md"

Closes #6160

See merge request !1481

#4961 modified remote API client edit to include lock and cancel, functions...

Closes #4961

See merge request !1453

Resolve "Remove APS Installer limit from limit-Template"

Closes #6130

See merge request !1472

Resolve "Remove dnssec-lookaside auto; from named.conf.options.master"

Closes #6156

See merge request !1476

Merge branch '6141-conf-custom-for-postfix-and-dovecot-not-working-on-centos-using-fedora-dist-script' into 'develop'

Resolve "Conf-custom for postfix and dovecot not working on CentOS (using fedora dist script)"

Closes #6141

See merge request !1477

Clarify remote update desc - apt instead of aptitude (#6155)

Closes #6155

See merge request ispconfig/ispconfig3!1479

Resolve "some rspamd templates not using conf-custom versions"

Closes #6158

See merge request !1478

update default firewall port list

See merge request !1451

Update interface/lib/classes/remote.d/client.inc.php, interface/lib/classes/functions.inc.php, interface/web/client/client_edit.php files

Ensure that we always have two capture groups in nginx redirect regex expressions

Closes #6144

See merge request ispconfig/ispconfig3!1468