In order to be able to call `serendipity_plugin_api_pre_event_hook` in a template's config.ini.php from serendipity.css.php, Smarty must be initialized first.
In case of a 'css' event, within the event hook $eventData contains the template's CSS which can now be manipulated and/or extended.
Some plugins make use of additional entry properties (title, body, extended, author) after being called by the 'backend_publish' hook, e.g.
* serendipity_event_forum
* serendipity_event_freetag
* serendipity_event_ljupdate
* serendipity_event_trackback
* serendipity_event_versioning
* serendipity_event_entryproperties
* serendipity_event_mailer
* serendipity_event_twitter
Thus we need to set these properties in the serendipity_updertEntry() method to make sure the plugins get the required data. Of course, we could fetch the entry either in overview.inc.php or again in each plugin, but that would mean an additional query to the DB.