PHP CS Fixer: clean up repo and adjust config

.php_cs.dist

.../Bridge/Twig/Tests/Extension/TranslationExtensionTest.php

...Symfony/Bundle/FrameworkBundle/Translation/Translator.php

src/Symfony/Component/Debug/Resources/ext/tests/001.phpt

src/Symfony/Component/Debug/Resources/ext/tests/002.phpt

src/Symfony/Component/Debug/Resources/ext/tests/002_1.phpt

src/Symfony/Component/Debug/Resources/ext/tests/003.phpt

...ymfony/Component/Debug/Tests/phpt/exception_rethrown.phpt

...omponent/Debug/Tests/phpt/fatal_with_nested_handlers.phpt

...ation/Session/Storage/Handler/LegacyPdoSessionHandler.php

...dation/Session/Storage/Handler/MemcacheSessionHandler.php

...ation/Session/Storage/Handler/MemcachedSessionHandler.php

...ndation/Session/Storage/Handler/MongoDbSessionHandler.php

src/Symfony/Component/HttpKernel/Client.php

src/Symfony/Component/HttpKernel/HttpCache/HttpCache.php

src/Symfony/Component/Routing/Route.php