Releases for Webform Mailchimp

Compatibility with Drupal 9. Bug fixes.

A few improvements

• Improved handler summary
• Allow for Other on email element selection (now supporting tokens)
• Remove most log messages as mailchimp takes care of logging those (avoiding duplicates)
• Detect an empty mail and/or list and log those.
• Add edit handler operation to the logger
• Fix a wrong theme hook warning appearing on the watchdog

- #2955353: AJAX error / PHP notice on adding handler - "Only variables should be passed by reference"
- #3081178: Add a custom webform_mailchimp mergetags alter for more advanced customization

Changes since 8.x-5.2:

Mainly this is a compatibility release with webform-8.x-5.0-beta17 that includes changes to the submission handler UI as well as a different constructor.

This will prevent different errors on the site.

- #2883538: Several improvements / Request for co-maintainership
- #2873221: Convert module to use short array syntax (new coding standard).

Ported Yamlform Mailchimp to Webform Mailchimp namespace.
The new branch name is 8.x-5.x in order to keep same version number as Webform module.

First version of a Webforms 4.x compatible Webforms integration.
Related issue: #1697874: Webform 4.x compatibility

Fixes bug that caused elements weight not to work.

Changes since alpha1:

Code should be stable by now, but bugs may still be lingering.

Changes since beta2:

• Issue #1185234: Allow multiple lists when merging fields - allow multiple lists when merging fields. Patch by mattwad.

Changes since 6.x-1.0-beta1:

• Feature [#1160206] by weseze - Add ability to hide checkbox.
• Feature [#1052290] by weseze - Add merge fields.
• Bug [#1136102] by PieterDC - wrong function name in _webform_display_mailchimp.
• [#1112840] by F.Romaniszin - E-mails didn't get sent to Mailchimp when using existing field.
• Stripping CVS keywords

First alpha release. Needs more testing.