Releases for CKEditor custom config

Beginning on September 9, 2022, this module's dependency on Drupal core's ckeditor module is now reinterpreted as a dependency upon the contrib ckeditor module as a result of Ensure that ckeditor does not get special core treatment. This is a change in Drupal.org's infrastructure and does not reflect any changes made by this module. As a result, it is no longer possible to support the core version of ckeditor.

Issues included in this release:

#3124517: $(...).drupalSetSummary is not defined on drupal/core by Tom Konda
#3119033: Update tests to define defaultTheme by Chris Burge

When updating to 8.x-3.x from 8.x-2.x, there is no automated upgrade path. Site owners will need to manually verify and update their site configuration. In most cases, only minor changes will be required.

The difference between the two branches is that 8.x-3.x supports JSON objects and arrays and 8.x-2.x does not. As a result, the config values must now be formatted as valid JSON.

This release cleans up code to conform to coding standards and adds Drupal 9 support.

Issues included in this release:

Commits since 8.x-2.0-rc1:
#2969666: Setting a configuration value as 'false' always evaluates to (boolean) TRUE by unobot, Chris Burge
#3051093: Implement hook_help() by Chris Burge, Satyanarayan Reddy

Note about update.php:
The primary difference between CKEditor custom config 8.x-2.x and 8.x-1.x is that custom configuration is now stored with the configuration of individual editors instead of being stored globally. During the upgrade process, the global configuration is copied to all CKEditor editors.