Adds in the Panel Button plugin for CKEditor.

This is required by plugins that need panel button to work, like Color Button.

Other plugins can leverage panel button by adding this in their plugin definition:

class YourButtonPlugin extends CKEditorPluginBase implements CKEditorPluginConfigurableInterface {
   * {@inheritdoc}
  public function getDependencies(Editor $editor) {
    return ['panelbutton'];

  // more code...


  1. Download the plugin from at least version 4.5.6.
  2. Place the plugin in the root libraries folder (/libraries).
  3. Enable Panel Button module in the Drupal admin.
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