Offer the possibility to override internal formatter objects from plugins

app/ServiceProvider/FormatterProvider.php

@@ -0,0 +1,48 @@
+<?php
+
+namespace Kanboard\ServiceProvider;
+
+use Kanboard\Core\Tool;
+use Pimple\Container;
+use Pimple\ServiceProviderInterface;
+
+/**
+ * Class FormatterProvider
+ *
+ * @package Kanboard\ServiceProvider
+ * @author  Frederic Guillot
+ */
+class FormatterProvider implements ServiceProviderInterface
+{
+    protected $formatters = array(
+        'Formatter' => array(
+            'BoardColumnFormatter',
+            'BoardFormatter',
+            'BoardSwimlaneFormatter',
+            'BoardTaskFormatter',
+            'GroupAutoCompleteFormatter',
+            'ProjectActivityEventFormatter',
+            'ProjectGanttFormatter',
+            'SubtaskTimeTrackingCalendarFormatter',
+            'TaskAutoCompleteFormatter',
+            'TaskCalendarFormatter',
+            'TaskGanttFormatter',
+            'TaskICalFormatter',
+            'TaskSuggestMenuFormatter',
+            'UserAutoCompleteFormatter',
+            'UserMentionFormatter',
+        )
+    );
+
+    /**
+     * Registers services on the given container.
+     *
+     * @param  Container $container
+     * @return Container
+     */
+    public function register(Container $container)
+    {
+        Tool::buildFactories($container, $this->formatters);
+        return $container;
+    }
+}