Update installer_base.lib.php to remove the creation of postfix self-signed cert prior to ISPConfig to avoid duplicity and time consuming, as it is now replaced and covered in function make_ispconfig_ssl_cert() via symlinks to the related files.

Update installer_base.lib.php to remove support for multi domain since it requires working vhost / conf for the added domains.

Update installer_base.lib.php for ISPConfig to use certbot webroot for webservers and certbot standalone for other servers. Also extend the certs for postfix, dovecot and pure-ftpd-mysql.

Update installer_base.lib.php to fix typo error and add code to extend ISPConfig LE SSL certs to other services that are postfix and pureftpd, if they are installed. The code give user option whether to extend the certs or not.

Update installer_base.lib.php accordingly to [Jesse Norell's suggestion](https://www.howtoforge.com/community/threads/wip-use-certbot-standalone-to-create-lets-encrypt-ssl-certs-for-ispconfig-servers.80449/#post-381238) which is supposedly more prudent.

Update installer_base.lib.php to change if (!@is_dir($le_live_dir) && ($svr_ip != $dns_ip)) to else.

Update installer_base.lib.php to use php instead of cli / shell command in renaming files and creating symlinks.

Update installer_base.lib.php as per the discussions / feedback in the thread at https://www.howtoforge.com/community/threads/wip-use-certbot-standalone-to-create-lets-encrypt-ssl-certs-for-ispconfig-servers.80449 by adding check whether the hostname fqdn A record has the same ip with the server before requesting for Let's Encrypt SSL standalone certs.

Update installer_base.lib.php to fix lines 2439-2441; remove line with .csr; use $conf['hostname'] if not localhost or empty.

Update installer_base.lib.php to use certbot standalone to create SSL certs for ISPConfig server(s).

Add description text for logging options.

Optimized prosody configuration for full conversations.im feature compartibility including full OMEMO support

Disabled sql-mode check in updater.

- Fixed #5027 add support for PHP 7.1 and 7.2 on nginx servers in apps vhost.
- suppress some warnings in simplepie.inc.php