Config fixings

- Delete now really overwrites static default/setting.config.php keys
- Delete now really overwrites static default/setting.config.php categories
- The Update::check() routine is added to different places
- Merge the given config file with the new config before writing
- Remove ConfigTransaction::get() because it's no more reliable

index.php

@@ -36,6 +36,9 @@ $dice = $dice->addRule(Friendica\App\Mode::class, ['call' => [['determineRunMode
 
 \Friendica\Core\Logger\Handler\ErrorHandler::register($dice->create(\Psr\Log\LoggerInterface::class));
 
+// Check the database structure and possibly fixes it
+\Friendica\Core\Update::check(\Friendica\DI::basePath(), true, \Friendica\DI::mode());
+
 $a = \Friendica\DI::app();
 
 \Friendica\DI::mode()->setExecutor(\Friendica\App\Mode::INDEX);