Fixed (partly) FS#2310 - Template switch not working in mailuser module, for dashlets and the login page

- Added "Generate Password" links to forms of the sites module.

- Fastcgi: delete .php-fcgi-starter directory if another PHP mode is used.

- Added "actions" framework in server to replace the functions provided by the core modules
- Moved system update function from remoteactins core module to software update plugin.

- Added PHP-FPM pm settings (pm.max_children, pm.start_servers, pm.min_spare_servers, pm.max_spare_servers) to the "Options" tab of a website.

Splitted the remote function permission array for the remote user form into separate config files. The new remote.conf.php files are located in the lib folder of the modules.