Adding a output filter over all rendered HTML

*Title: Adding a output filter over all rendered HTML.

*Documentation:
The new functionality can be used to modify HTML before it send to the client/browser. 
Cases where you might want ot use it are for example for content acceleration.
With certain filters you point static files to get served from different servers in order 
to speed up the devlivery of a global website. For example you can point the user to 
static files that are close to his location. Using this technique can imensivly increase
 the user experience. In a test case sencario we have improved the load time of the website by over 80%.

You can configure a new output filter by setting site.ini[OutputSettings].OutputFilterName.


Example (Serving static files from a differnet host):

edit in site.ini
[OutputSettings]
OutputFilterName=myFilter

<?php
class myFilter
{     
	static function filter( $output )
	{
        $patterns = array();
        $patterns[0] = '/((\/extension\/.*|)\/design\/[a-z0-9_-]*\/(stylesheets|images|javascript)\/.*\.(gif|jpg|png|js|css))/isU';
        $replacements = array();
        $replacements[0] = 'http://static.example.com\1';
        return preg_replace($patterns, $replacements, $output );
	}
}
?>

Further thinking about content acceleration you can also implement a mechanism
 where static content is deliver from host closest to a users location.
A user from the united states could get static files served from the host
 static.us.example.com and one from china could get files served from static.cn.example.com.