mailchimp 8.x-1.4

Changes since 8.x-1.3:

• Added Connected Sites integration.
• Updated MailChimp library to the latest version.
• #2903123 by ytsurk, OnkelTem: Mergefields can not be translated: Email Address, First Name, Last Name
• #2904057 by LilyB: "The website encountered an unexpected error." on Mailchimp Campaigns page
• #2785699 by ChrisGrewe, jhuhta, asrob: Get Campaigns fails if one campaign does not exist
• #2826193 by gnuget, mlncn: Let Access webhook endpoint even if the user hasn't the access content perm
• #2875974 by Andreas Radloff, rpataca: Allow sending campaigns to static segments
• #2823996 by rodrigoaguilera, jochemvn: Mailchimp Signup permissions not defined
• #2919312 by Lukas von Blarer: Error: Call to undefined function watchdog() in mailchimp_subscribe_process()
• #2899683 by a.hover, martins.bertins, switzern: Missing empty check - "Undefined property: stdClass::$interests in ...\MailchimpSignupPageForm->submitForm()"
• #2790041 by casey, mariacha1, Andreas Radloff, swentel, mandclu, kiwad, asrob, johnhanley, rsmylski, jason.bell: mailchimp_get_memberinfo logs 404 errors when not really an error
• #2777207 by asrob, tikaszvince, amyvs, JimSmith: Converting token will fail if there is/are quotation mark(s)
• #2908547 by Berdir: Finish port of merge field population logic
• #2869080 by chrlvclaudiu, progzy, Berdir: Update Mailchimp Mergevar Values - Fatal error
• #2925258 by Berdir: Fatal error on admin/config/services/mailchimp caused by call to l()