Make new classes strict and fix license header

Signed-off-by: Christoph Wurst <christoph@winzerhof-wurst.at>

core/Migrations/Version14000Date20180522074438.php

 <?php
+declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>

lib/private/Authentication/TwoFactorAuth/ProviderLoader.php

 <?php
+declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>

lib/private/Authentication/TwoFactorAuth/ProviderSet.php

 <?php
+declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>

tests/lib/Authentication/TwoFactorAuth/Db/ProviderUserAssignmentDaoTest.php

 <?php
+declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>

tests/lib/Authentication/TwoFactorAuth/ProviderLoaderTest.php

 <?php
+declare(strict_types=1);
 
 /**
- * Created by PhpStorm.
- * User: christoph
- * Date: 04.06.18
- * Time: 13:29
+ * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @author 2018 Christoph Wurst <christoph@winzerhof-wurst.at>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
  */
 
 namespace lib\Authentication\TwoFactorAuth;

tests/lib/Authentication/TwoFactorAuth/ProviderSetTest.php

 <?php
+declare(strict_types=1);
 
 /**
  * @copyright 2018 Christoph Wurst <christoph@winzerhof-wurst.at>