Move legacy classes from PSR0 to PSR4

composer.json

lib/composer/composer/autoload_classmap.php

lib/composer/composer/autoload_namespaces.php

lib/composer/composer/autoload_psr4.php

lib/composer/composer/autoload_static.php

lib/private/legacy/OC_API.php

lib/private/legacy/OC_App.php

lib/private/legacy/OC_DB.php

lib/private/legacy/OC_DB_StatementWrapper.php

lib/private/legacy/OC_Defaults.php

lib/private/legacy/OC_EventSource.php

lib/private/legacy/OC_FileChunking.php

lib/private/legacy/OC_Files.php

lib/private/legacy/OC_Helper.php

lib/private/legacy/OC_Hook.php

lib/private/legacy/OC_Image.php

lib/private/legacy/OC_JSON.php

lib/private/legacy/OC_Response.php

lib/private/legacy/OC_Template.php

lib/private/legacy/OC_User.php