* Remove ext/imap — it has been moved to PECL
https://pecl.php.net/package/imap
* Remove files related to IMAP
* Remove IMAP CI files and set up
* Also disable IMAP on Circle CI
* Update CREDITS file
* Remove IMAP entry from CODEOWNERS
* Revert "Remove files related to IMAP"
This reverts commit a05ffd6c97.
* Mark IMAP is being removed
* Revert "Remove IMAP CI files and set up"
This reverts commit 82e5ba9910.
* Revert "Also disable IMAP on Circle CI"
This reverts commit e83827b0b2.
* Don't try to build imap extension with CI
* Restore test setup files
* Remove mention of imap in labeler, EXTENSIONS, and sample php.ini files