MailWizz - Email Marketing Application 2.6.6

[CHG] - The priority for the email address used in list unsubscribe is (low < high): Campaign Reply To < Server Forced Reply To < Customer Group: List Unsubscribe Header Email
[CHG] - Country name change: Swaziland => Eswatini
[MSC] - Overall fixes
[UPD] - Updated composer packages

[BUG] - Unparsed URLs in web version when opened without a subscriber identifier
[CHG] - Bounces / FBLs / EBMs will not be identified via custom headers anymore BUT only via the original message id
[RMV] - Removed all custom headers used to identify a campaign / subscribers, we're using the Message-Id header now
[BUG] - URL would not be normalised in some cases when doing redirects for tracking
[BUG] - Possible duplicate open tracking pixel under certain circumstances
[ENH] - Make sure we add the open tracking pixel only if it does not exists in the content
[BUG] - Remove Postmark delivery server casting to array which would cause the message to deliver but report it did not
[MSC] - Overall fixes
[UPD] - Updated composer packages

[ADD] - Added a new chart in the list overview showing the growth/shrink over a period. The hourly cron is handling creating the counters
[MSC] - Overall fixes
[UPD] - Updated composer packages