Created a modular syslog handler system

I've split all log handlers into classes so that people can make
new log handler systems without making changes to the core.
Also, now every log handler can handle how and what will be logged.

htdocs/core/modules/syslog/logHandlerInterface.php

@@ -0,0 +1,12 @@
+<?php
+
+interface LogHandlerInterface
+{
+	public function getName();
+	public function getVersion();
+	public function getInfo();
+	public function configure();
+	public function checkConfiguration();
+	public function isActive();
+	public function export($content);
+}