Revise generator list for 4.x

[Chi-teck]

Are all these generators still relevant?

In order to reduce maintenance cost we could possibly drop some of these generators.

Available commands:
  completion                         Dump the shell completion script
  composer                           [composer.json] Generates a composer.json file
  controller                         Generates a controller
  field                              Generates a field
  help                               Display help for a command
  hook                               Generates a hook
  install-file                       Generates an install file
  javascript                         Generates Drupal JavaScript file
  layout                             Generates a layout
  list                               List commands
  module                             Generates Drupal module
  phpstorm-meta                      Generates PhpStorm metadata
  plugin-manager                     [plugin-manager] Generates plugin manager
  readme                             Generates README file
  render-element                     Generates Drupal render element
  service-provider                   Generates a service provider
  single-directory-component         [sdc] Generates Drupal SDC theme component
  template                           [template] Generates a template
  theme                              Generates Drupal theme
  theme-settings                     Generates Drupal theme-settings.php file
 drush
  drush:symfony-command              [symfony-command] Generates Symfony console command
 entity
  entity:bundle-class                [bundle-class] Generate a bundle class for a content entity.
  entity:configuration               [config-entity] Generates configuration entity
  entity:content                     [content-entity] Generates content entity
 form
  form:config                        [config-form] Generates a configuration form
  form:confirm                       [confirm-form] Generates a confirmation form
  form:simple                        [form] Generates simple form
 misc
  misc:apache-virtual-host           [apache-virtual-host] Generates an Apache site configuration file
  misc:nginx-virtual-host            [nginx-virtual-host] Generates an Nginx site configuration file
 plugin
  plugin:action                      [action] Generates action plugin
  plugin:block                       [block] Generates block plugin
  plugin:ckeditor                    [ckeditor|ckeditor-plugin] Generates CKEditor plugin
  plugin:condition                   [condition] Generates condition plugin
  plugin:constraint                  [constraint] Generates constraint plugin
  plugin:entity-reference-selection  [entity-reference-selection] Generates entity reference selection plugin
  plugin:field:formatter             [field-formatter] Generates field formatter plugin
  plugin:field:type                  [field-type] Generates field type plugin
  plugin:field:widget                [field-widget] Generates field widget plugin
  plugin:filter                      [filter] Generates filter plugin
  plugin:menu-link                   [menu-link] Generates menu-link plugin
  plugin:migrate:destination         [migrate-destination] Generates migrate destination plugin
  plugin:migrate:process             [migrate-process] Generates migrate process plugin
  plugin:migrate:source              [migrate-source] Generates migrate source plugin
  plugin:queue-worker                [queue-worker] Generates queue worker plugin
  plugin:rest-resource               [rest-resource] Generates rest resource plugin
  plugin:views:argument-default      [views-argument-default] Generates views default argument plugin
  plugin:views:field                 [views-field] Generates views field plugin
  plugin:views:style                 [views-style] Generates views style plugin
 service
  service:access-checker             [access-checker] Generates an access checker service
  service:breadcrumb-builder         [breadcrumb-builder] Generates a breadcrumb builder service
  service:cache-context              [cache-context] Generates a cache context service
  service:custom                     [custom-service] Generates a custom Drupal service
  service:event-subscriber           [event-subscriber] Generates an event subscriber
  service:logger                     [logger] Generates a logger service
  service:middleware                 [middleware] Generates a middleware
  service:param-converter            [param-converter] Generates a param converter service
  service:path-processor             [path-processor] Generates a path processor service
  service:request-policy             [request-policy] Generates a request policy service
  service:response-policy            [response-policy] Generates a response policy service
  service:route-subscriber           [route-subscriber] Generates a route subscriber
  service:theme-negotiator           [theme-negotiator] Generates a theme negotiator
  service:twig-extension             [twig-extension] Generates Twig extension service
  service:uninstall-validator        [uninstall-validator] Generates a uninstall validator service
 test
  test:browser                       [browser-test] Generates a browser based test
  test:kernel                        [kernel-test] Generates a kernel based test
  test:nightwatch                    [nightwatch-test] Generates a nightwatch test
  test:unit                          [unit-test] Generates a unit test
  test:webdriver                     [webdriver-test] Generates a test that supports JavaScript
 yml
  yml:breakpoints                    [breakpoints] Generates a breakpoints yml file
  yml:links:action                   [action-links] Generates a links.action yml file
  yml:links:contextual               [contextual-links] Generates links.contextual yml file
  yml:links:menu                     [menu-links] Generates a links.menu yml file
  yml:links:task                     [task-links] Generates a links.task yml file
  yml:migration                      [migration|migration.yml] Generates a migration yml file
  yml:module-libraries               [module-libraries] Generates module libraries yml file
  yml:permissions                    [permissions|permissions.yml] Generates a permissions yml file
  yml:routing                        [routing|routing.yml] Generates a routing yml file
  yml:services                       [services|services.yml] Generates a services yml file
  yml:theme-libraries                [theme-libraries] Generates theme libraries yml file