- fixed rspamd settings
- fixed errors in webserver plugin
- fixed error in dkim domain handling

- TODO: the server services plugin is not capable of enabling and disabling addon plugins, yet

- improved rspamd handling

- changed some rspamd config to new syntax

This reverts merge request !841

- sourced out duplicate code

Add description text for logging options.

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

Fixed#5019 LE cert problem in mirror setups. This patch disables the creation of Let's encrypt SSL certs on mirrored slave servers.

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

global option to enable pagespeed with nginx - allows to enable pagespeed even if no webserver-config is selected