- remove all PHP "_ZMQ_" related dependencies from Pathfinder. PHP´s native Sockets work as replacement

- added status information for "WebSocket" installations to `/setup` page (e.g. active connections, startup time)
- removed "ext-zmq" as required PHP extension
- removed "react/zmq" as required Composer package
- removed "websoftwares/monolog-zmq-handler" as required Composer package

app/main/lib/logging/handler/SocketHandler.php

@@ -0,0 +1,55 @@
+<?php
+/**
+ * Created by PhpStorm.
+ * User: Exodus 4D
+ * Date: 23.02.2019
+ * Time: 19:11
+ */
+
+namespace lib\logging\handler;
+
+
+use Monolog\Logger;
+
+class SocketHandler extends \Monolog\Handler\SocketHandler {
+
+    /**
+     * some meta data (additional processing information)
+     * @var array|string
+     */
+    protected $metaData                 = [];
+
+    public function __construct($connectionString, $level = Logger::DEBUG, $bubble = true, $metaData = []){
+        $this->metaData = $metaData;
+
+        parent::__construct($connectionString, $level, $bubble);
+    }
+
+    /**
+     * overwrite default handle()
+     * -> change data structure after processor() calls and before formatter() calls
+     * @param array $record
+     * @return bool
+     */
+    public function handle(array $record){
+        if (!$this->isHandling($record)) {
+            return false;
+        }
+
+        $record = $this->processRecord($record);
+
+        $record = [
+            'task' => 'logData',
+            'load' => [
+                'meta' => $this->metaData,
+                'log' => $record
+            ]
+        ];
+
+        $record['formatted'] = $this->getFormatter()->format($record);
+
+        $this->write($record);
+
+        return false === $this->bubble;
+    }
+}