Bug fixes

This is a relatively stable point for the digest module. Some performance changes might be yet to come.

#3213287: Revision user not set on initial save

Adjust docblock in updater

• Casts rendered twig to string context. Fixes an edge case where twig-parsed Patternkit block configs won't be usable for template tests without a `|render`.
• Issue #3211024: [9.1.x] Fatal Error on patternkit block save. Resolves an edge case with block saves on latest Drupal 9 core.
• Adds CKEditor as default for HTML theme. If you select the 'HTML' theme for Patternkit, you can now use Drupal's CKEditor install.
• Adds baseline wysiwyg installs. Patternkit now ships with an experimental build of Quill, and examples for other popular editors.

• Casts rendered twig to string context. Fixes an edge case where twig-parsed Patternkit block configs won't be usable for template tests without a `|render`.
• Issue #3211024: [9.1.x] Fatal Error on patternkit block save. Resolves an edge case with block saves on latest Drupal 9 core.
• Adds CKEditor as default for HTML theme. If you select the 'HTML' theme for Patternkit, you can now use Drupal's CKEditor install.
• Adds baseline wysiwyg installs. Patternkit now ships with an experimental build of Quill, and examples for other popular editors.

Drupal 9 compatibility.