- Convert to USES localbase
- Update mail/cone to 1.0 [1]
- Update mail/courier-imap to 5.0.0
- Add LICENSE
- Update mail/maildrop to 3.0.0
- Remove IDN option since it's now mandatory
- Update mail/sqwebmail to 6.0.0 [2]
- Update security/courier-authlib to 0.69.0
- Add note to UPDATING
- Silence some portlint warnings

PR:			231471 [1]
Submitted by:		me
Approved by:		Maintainer timeout [1],
			oliver@ [2]
Differential Revision:	https://reviews.freebsd.org/D17234