Enable OTP 2FA

- Update SchebTwoFactorBundle to version 3
- Enable Google 2fa on the bundle
- Disallow ability to use both email and google as 2fa
- Update Ocramius Proxy Manager to handle typed function & attributes (from PHP 7)
- use `$this->addFlash` shortcut instead of `$this->get('session')->getFlashBag()->add`
- update admin to be able to create/reset the 2fa

app/DoctrineMigrations/Version20181202073750.php

@@ -0,0 +1,22 @@
+<?php
+
+namespace Application\Migrations;
+
+use Doctrine\DBAL\Schema\Schema;
+use Wallabag\CoreBundle\Doctrine\WallabagMigration;
+
+/**
+ * Add 2fa OTP (named google authenticator).
+ */
+final class Version20181202073750 extends WallabagMigration
+{
+    public function up(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE ' . $this->getTable('user') . ' ADD googleAuthenticatorSecret VARCHAR(191) DEFAULT NULL, CHANGE twoFactorAuthentication emailTwoFactor BOOLEAN NOT NULL, DROP trusted');
+    }
+
+    public function down(Schema $schema): void
+    {
+        $this->addSql('ALTER TABLE `' . $this->getTable('user') . '` DROP googleAuthenticatorSecret, CHANGE emailtwofactor twoFactorAuthentication BOOLEAN NOT NULL, ADD trusted TEXT DEFAULT NULL');
+    }
+}