Type hint for Singleton

core/API/Proxy.php

core/Config.php

core/DataTable/Manager.php

core/Db/Schema.php

core/EventDispatcher.php

core/FrontController.php

core/Log.php

core/Menu/MenuAbstract.php

core/Plugin/Manager.php

core/Registry.php

plugins/CoreConsole/RunTests.php

plugins/ExamplePlugin/config/local.config.php

plugins/SitesManager/API.php

plugins/UserCountryMap/UserCountryMap.php

tests/PHPUnit/IntegrationTestCase.php

tests/PHPUnit/UITest.php

tests/README.md