Merge "Convert OutputHandler functions to a class"

diff --combined autoload.php
index 6386a5e,e61eec2..eb3d776
--- 1/autoload.php
--- 2/autoload.php
+++ b/autoload.php
@@@ -911,6 -911,7 +911,7 @@@ $wgAutoloadLocalClasses = 
        'MediaWiki\\Logger\\NullSpi' => __DIR__ . '/includes/debug/logger/NullSpi.php',
        'MediaWiki\\Logger\\Spi' => __DIR__ . '/includes/debug/logger/Spi.php',
        'MediaWiki\\MediaWikiServices' => __DIR__ . '/includes/MediaWikiServices.php',
+       'MediaWiki\\OutputHandler' => __DIR__ . '/includes/OutputHandler.php',
        'MediaWiki\\Preferences\\DefaultPreferencesFactory' => __DIR__ . '/includes/preferences/DefaultPreferencesFactory.php',
        'MediaWiki\\Preferences\\PreferencesFactory' => __DIR__ . '/includes/preferences/PreferencesFactory.php',
        'MediaWiki\\ProcOpenError' => __DIR__ . '/includes/exception/ProcOpenError.php',
@@@ -1727,7 -1728,6 +1728,7 @@@
        'Wikimedia\\Rdbms\\SQLiteField' => __DIR__ . '/includes/libs/rdbms/field/SQLiteField.php',
        'Wikimedia\\Rdbms\\SavepointPostgres' => __DIR__ . '/includes/libs/rdbms/database/utils/SavepointPostgres.php',
        'Wikimedia\\Rdbms\\SessionConsistentConnectionManager' => __DIR__ . '/includes/libs/rdbms/connectionmanager/SessionConsistentConnectionManager.php',
 +      'Wikimedia\\Rdbms\\Subquery' => __DIR__ . '/includes/libs/rdbms/encasing/Subquery.php',
        'Wikimedia\\Rdbms\\TransactionProfiler' => __DIR__ . '/includes/libs/rdbms/TransactionProfiler.php',
        'WikitextContent' => __DIR__ . '/includes/content/WikitextContent.php',
        'WikitextContentHandler' => __DIR__ . '/includes/content/WikitextContentHandler.php',