Feature/merge 3 0 develop (#298)

* merging 3.0 into develop

* N°5102 - Allow to send emails (eg. notifications) using GSuite SMTP and OAuth
* migration to iTop 3.1

Co-authored-by: Eric Espie <eric.espie@combodo.com>

sources/Controller/OAuth/OAuthLandingController.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Combodo\iTop\Controller\OAuth;
+
+use Combodo\iTop\Application\TwigBase\Controller\Controller;
+
+class OAuthLandingController extends Controller
+{
+	public function OperationLanding()
+	{
+		$this->DisplayPage([]);
+	}
+}