Issue #1734904 by tim.plunkett: Clean up plugins.

lib/Drupal/views/Analyzer.php

lib/Drupal/views/Join.php

lib/Drupal/views/JoinSubquery.php

lib/Drupal/views/Plugin/Discovery/ViewsDiscovery.php

lib/Drupal/views/Plugin/Type/ViewsPluginManager.php

lib/Drupal/views/Plugin/views/Handler.php

lib/Drupal/views/Plugin/views/Plugin.php

lib/Drupal/views/Plugin/views/access/AccessPluginBase.php

lib/Drupal/views/Plugin/views/access/None.php

lib/Drupal/views/Plugin/views/access/Permission.php

lib/Drupal/views/Plugin/views/access/Role.php

lib/Drupal/views/Plugin/views/area/AreaPluginBase.php

lib/Drupal/views/Plugin/views/area/Broken.php

lib/Drupal/views/Plugin/views/area/Result.php

lib/Drupal/views/Plugin/views/area/Text.php

lib/Drupal/views/Plugin/views/area/TextCustom.php

lib/Drupal/views/Plugin/views/area/View.php

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

lib/Drupal/views/Plugin/views/argument/Broken.php

lib/Drupal/views/Plugin/views/argument/Date.php