Create Constant Contact Webform Element

Merged this into 4.x-dev release →

• When trying this out, if you happen to install webform and the configuration for the options list before enabling lists, they don't show up in the available options.
• Also need to test more using the webform handler token for a multi-value field.

Took a look at the webform_mailchimp → module and it does not have a webform element (from what I can tell) that allows you to choose from available lists.

Updates to 4.x-dev release and soon will release 4.0.0-rc1 with this.

I was able to do some testing and fixed a bug on multi-value fields with the contact list webform element.

Updated documentation.
Adjusted handler to submit for multi-values and using the webform submission value tokens.

Decided I should use 3.1.x instead of 4. This isn't really a breaking change.

Closing due to inactivity. We can reopen or create a new issue if there is more to fix.