Issue #2002272 by elvis2, jibran, heddn: Rename Views method add_orderby() to addOrderby().

...b/Drupal/comment/Plugin/views/sort/NcsLastCommentName.php

...t/lib/Drupal/comment/Plugin/views/sort/NcsLastUpdated.php

...s/comment/lib/Drupal/comment/Plugin/views/sort/Thread.php

...dules/field/lib/Drupal/field/Plugin/views/field/Field.php

...ules/search/lib/Drupal/search/Plugin/views/sort/Score.php

...Drupal/views/Plugin/views/argument/ArgumentPluginBase.php

...s/lib/Drupal/views/Plugin/views/field/FieldPluginBase.php

...modules/views/lib/Drupal/views/Plugin/views/query/Sql.php

...modules/views/lib/Drupal/views/Plugin/views/sort/Date.php

...ews/lib/Drupal/views/Plugin/views/sort/GroupByNumeric.php

...iews/lib/Drupal/views/Plugin/views/sort/MenuHierarchy.php

...dules/views/lib/Drupal/views/Plugin/views/sort/Random.php

...ews/lib/Drupal/views/Plugin/views/sort/SortPluginBase.php

...b/Drupal/views_test_data/Plugin/views/query/QueryTest.php