Qt: Update Qt 6 to 6.4.2

As a patch release, Qt 6.4.2 does not introduce any new features but
contains ~ 150 bug fixes, security updates, and other improvements to
the top of the Qt 6.4.1 release. See more information about the most
important changes and bug fixes from Qt 6.4.2 release note.

Announcement:	https://www.qt.io/blog/qt-6.4.2-released
Release
Notes:	https://code.qt.io/cgit/qt/qtreleasenotes.git/about/qt/6.4.2/release-note.md

Qt: Update Qt6 to 6.4.1

Qt 6.4.1 release is a patch release made on the top of Qt 6.4.0.  As a
patch release, Qt 6.4.1 does not add any new functionality but provides
bug fixes and other improvements and maintains both forward and backward
compatibility (source and binary) with Qt 6.4.0.

For detailed information about Qt 6.4, refer to the online documentation
included in this distribution. The documentation is also available
online:

https://doc.qt.io/qt-6/index.html

Changelog:
https://code.qt.io/cgit/qt/qtreleasenotes.git/about/qt/6.4.1/release-note.md

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

Qt: Update Qt6 to 6.4.0

Relase Notes: https://www.qt.io/blog/qt-6.4-released

QT: Update Qt 6 to 6.3.2

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.

qt6: do not install empty cmake & pkgconfig directories in Qt-prefix

Qt6: Import Qt6 ports form kde@'s repository

This change brings in the new Qt6 stack, which might still be a bit
in flux in the ports tree for a while.

Obtained from https://github.com/freebsd/freebsd-ports-kde/tree/qt6-6.3.1
with commits from lbartoletti and myself.

Note:
ww/qt6-webengine will land once kai wins another round of patching boundled
chromiums sources.

Exp-run by:	antoine
PR:		265843
Differential Revision: https://reviews.freebsd.org/D36179