Added event for removed comments with some refactoring

app/EventBuilder/CommentEventBuilder.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Kanboard\EventBuilder;
+
+use Kanboard\Event\CommentEvent;
+
+/**
+ * Class CommentEventBuilder
+ *
+ * @package Kanboard\EventBuilder
+ * @author  Frederic Guillot
+ */
+class CommentEventBuilder extends BaseEventBuilder
+{
+    protected $commentId = 0;
+
+    /**
+     * Set commentId
+     *
+     * @param  int $commentId
+     * @return $this
+     */
+    public function withCommentId($commentId)
+    {
+        $this->commentId = $commentId;
+        return $this;
+    }
+
+    /**
+     * Build event data
+     *
+     * @access public
+     * @return CommentEvent|null
+     */
+    public function build()
+    {
+        $comment = $this->commentModel->getById($this->commentId);
+
+        if (empty($comment)) {
+            return null;
+        }
+
+        return new CommentEvent(array(
+            'comment' => $comment,
+            'task' => $this->taskFinderModel->getDetails($comment['task_id']),
+        ));
+    }
+}