devel/icu: update to 73.1

- Temporarily switch to GitHub auto archive (release artifacts are N/A atm)

Changes:	https://github.com/unicode-org/icu/releases/tag/release-73-1
Reported by:	GitHub (watch releases)
PR:		270422
Exp-run by:	antoine

devel/icu: update to 72.1

Changes:	https://github.com/unicode-org/icu/releases/tag/release-72-1
Reported by:	GitHub (watch releases)
PR:		266582
Exp-run by:	antoine

Mk/Uses: always use colon for build/run suffix

Most USES use a colon for build/run(/test) suffixes. Change kde.mk,
qt.mk and pyqt.mk to do the same, and update all ports using that.

Document in CHANGES.

PR:			266034
Exp-run by:		antoine
Approved by:		tcberner (mentor)
Differential Revision:	https://reviews.freebsd.org/D36349

Remove WWW entries moved into port Makefiles

Commit b7f05445c00f has added WWW entries to port Makefiles based on
WWW: lines in pkg-descr files.

This commit removes the WWW: lines of moved-over URLs from these
pkg-descr files.

Approved by:		portmgr (tcberner)

Add WWW entries to port Makefiles

It has been common practice to have one or more URLs at the end of the
ports' pkg-descr files, one per line and prefixed with "WWW:". These
URLs should point at a project website or other relevant resources.

Access to these URLs required processing of the pkg-descr files, and
they have often become stale over time. If more than one such URL was
present in a pkg-descr file, only the first one was tarnsfered into
the port INDEX, but for many ports only the last line did contain the
port specific URL to further information.

There have been several proposals to make a project URL available as
a macro in the ports' Makefiles, over time.

*/*: bump all consumers after recent boost upgrade

devel/boost-all: bump all library consumers after boost upgrade

PR:	246106

devel/icu: update to 71.1

Changes:	https://github.com/unicode-org/icu/releases/tag/release-71-1
Reported by:	GitHub (watch releases)
PR:		262654
Exp-run by:	antoine
Approved by:	fluffy

graphics/epsonscan2: Add new port for Epson Scanners

This is a port of the Seiko/Epson Epsonscan2 scanner engine and GUI[1].

It provides a complete alternative to sane/xsane with its own scanner engine and
GUI.
It also provides a sane back-end library (libsane-epsonscan2.so) so that it
works with the sane package.

There are two parts to this port:
  - graphics/epsonscan2 - the main scanner engine and GUI that
    works with (most) USB scanners
  - graphics/epsonscan2-non-free-plugin - support for Epson's
    Linux binary that adds network access to scanners and
    usb access to some particular scanners

Please read the file %%PREFIX%%/lib/epsonscan2/Read_me.FreeBSD for notes on how
to set this up and use it.

[1] https://download.ebz.epson.net/man/linux/epsonscan2_e.html

PR:		261891
Reviewed by:	(partly) Tatsuki Makino <tatsuki_makino@hotmail.com>, diizzy@