Releases for Previewable email templates

#3318893: Mismatched entity and/or field definitions after update to 8.x-4.1

Issue #2809023 by zoltee: When invoked from Rules, BCC is not sent.
Issue #2537706 by mqanneh: Missing configuration link and menu link description.

This might bee last release for Drupal 7.

Fixed many issues, PET module is now more stable.
#2802667: "View PET Entities" permission broken
#2858370: WSOD when loading pet preview with uid parameter

Basic functionality is ported to Drupal 8. Please test and report issues.

Following issues are fixed

• #2184191 - Improve Ease of administration of Pets by adding sorts and increasing pager.
• #1902766 - pet_send_one_mail should return message status
• #2008768 - Make pet watchdog for successful emails optional.
• #2100373 - Empty tokens
• #1945634 - Undefined $params['pet_nid'] and $params['pet_uid'] cause strict warnings (fixed)
• #2087959 - Couldn't use pet_send_mail() when custom tokens should be used
• #1869798 - Add "Reply to" field

- fixed #1853700: Fatal error: Call to undefined function pet_isset_or()

* Removed need to precede emails with "uid|" when performing user token substitution. UID is looked up automatically. Also applies to recipient callback functions. Backward compatibility provided.
* Multiple To recipients via form element supported, along with overriding path default UID.
* CC and BCC fields added, with defaults possible per template
* From is customizable per template
* Path-based invocation of recipient callback changed from "uid=xxx" to "recipient_callback=true". Backward compatibility provided.
* Package changed to Mail from Email

removed debugging statement - otherwise no difference over (major) upgrade in 6.x-1.1
there is no release 6.x-1.2

Views and CCK support.