- use clientdb config for addon sql files

- fixes in addon installer

- do not install/update addons during install/update of ISPconfig. This only leads to lots of trouble

- do not install/update addons during install/update of ISPconfig. This only leads to lots of trouble

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

- changed some rspamd config to new syntax

- sourced out duplicate code

Preserve body structure in send_notification_email