Subtasks events refactoring and show delete in activity stream

app/Job/SubtaskEventJob.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Kanboard\Job;
+
+use Kanboard\EventBuilder\SubtaskEventBuilder;
+
+/**
+ * Class SubtaskEventJob
+ *
+ * @package Kanboard\Job
+ * @author  Frederic Guillot
+ */
+class SubtaskEventJob extends BaseJob
+{
+    /**
+     * Set job params
+     *
+     * @param  int     $subtaskId
+     * @param  string  $eventName
+     * @param  array   $values
+     * @return $this
+     */
+    public function withParams($subtaskId, $eventName, array $values = array())
+    {
+        $this->jobParams = array($subtaskId, $eventName, $values);
+        return $this;
+    }
+
+    /**
+     * Execute job
+     *
+     * @param  int    $subtaskId
+     * @param  string $eventName
+     * @param  array  $values
+     * @return $this
+     */
+    public function execute($subtaskId, $eventName, array $values = array())
+    {
+        $event = SubtaskEventBuilder::getInstance($this->container)
+            ->withSubtaskId($subtaskId)
+            ->withValues($values)
+            ->build();
+
+        if ($event !== null) {
+            $this->dispatcher->dispatch($eventName, $event);
+        }
+    }
+}