Move to IBootstrap initialization and remove the deprecated appinfo/app.php

appinfo/app.php

@@ -1,31 +0,0 @@
-<?php
-/**
- * Nextcloud - user_sql
- *
- * @copyright 2012-2015 Andreas Böhler <dev (at) aboehler (dot) at>
- * @copyright 2018 Marcin Łojewski <dev@mlojewski.me>
- * @author    Marcin Łojewski <dev@mlojewski.me>
- *
- * 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 <https://www.gnu.org/licenses/>.
- */
-
-use OCA\UserSQL\AppInfo\Application;
-use OCP\AppFramework\QueryException;
-
-try {
-    $app = new Application();
-    $app->registerBackends();
-} catch (QueryException $queryException) {
-    OC::$server->getLogger()->logException($queryException);
-}