Merge pull request #23819 from owncloud/move-core-completely-to-psr4

core/Command/App/CheckCode.php

core/Command/App/Disable.php

core/Command/App/Enable.php

core/Command/App/GetPath.php

core/Command/App/ListApps.php

core/Command/Background/Ajax.php

core/Command/Background/Base.php

core/Command/Background/Cron.php

core/Command/Background/WebCron.php

core/Command/Base.php

core/Command/Check.php

core/Command/Config/App/DeleteConfig.php

core/Command/Config/App/GetConfig.php

core/Command/Config/App/SetConfig.php

core/Command/Config/Import.php

core/Command/Config/ListConfigs.php

core/Command/Config/System/DeleteConfig.php

core/Command/Config/System/GetConfig.php

core/Command/Config/System/SetConfig.php

core/Command/Db/ConvertType.php