all: drop support for FreeBSD 13.2 which reached EOL today

Thanks again to jbeich for noticing various things I overlooked.

Reviewed by:	acm, ashish, eduardo, ehaupt, eugen, jbeich, martymac, mat,
nobukata, sunpoet, tagattie, yuri, arrowd, kde
Differential Revision:	https://reviews.freebsd.org/D45141

MANPREFIX: eliminate the use of MANPREFIX for x11*

While here move some manpages to share/man

x11-wm/subtle: Fix build with llvm16

Approved by:	portmgr (blanket)
Sponsored by:	The FreeBSD Foundation

x11-wm/subtle: unbreak the port's build against new Ruby versions

File.exists? method has been deprecated and removed in Ruby 3.2.0,
adjust the code accordingly.

PR:	269177

Mk/**ruby.mk: Switch from USE_RUBY=yes to USES=ruby

Switch from Mk/bsd.ruby.mk to Mk/Uses/ruby.mk

Notable changes are.

- Mk/bsd.ruby.mk is moved to Mk/Uses/ruby.mk.
- USE_RUBY=yes is replaced with USES=ruby.
- USE_RUBY_EXTCONF is replaced with USES=ruby:extconf.
- USE_RUBY_RDOC is replaced with USES=ruby:rdoc.
- USE_RUBY_SETUP is replaces with USES=ruby:setup.
- RUBY_NO_BUILD_DEPENDS and RUBY_NO_RUN_DEPENDS are replaced with
  USES=ruby:{build,none,run}.
- RUBY_REQUIRE isn't used anywhere, so removed.
- USES=gem now implies USES=ruby.

This is mainly the work of yasu@ at https://reviews.freebsd.org/D27863

I have just made some cosmetic changes and ran exp-run to test that the
tree is not in a BROKEN state.

Approved by:	portmgr
Differential Revision:	https://reviews.freebsd.org/D37925

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.

x11-wm: remove 'Created by' lines

A big Thank You to the original contributors of these ports:

  *  Adam Weinberger
  *  Alejandro Pulver <alepulver@FreeBSD.org>
  *  Alexey Dokuchaev <danfe@FreeBSD.org>
  *  Alexey Dokuchaev <danfe@regency.nsu.ru>
  *  Andreas Kohn <andreas@syndrom23.de>
  *  Anton Tornqvist <antont@inbox.lv>
  *  Aragon Gouveia <aragon@phat.za.net>
  *  Babak Farrokhi <babak@farrokhi.net>
  *  Brett Taylor <brett@peloton.physics.montana.edu>
  *  Brian Handy <handy@physics.montana.edu>
  *  Bruce A. Mah <bmah@ca.sandia.gov>

x11-wm/subtle: unbreak the build against Ruby 3.x (upcoming default).

PR:	262543

Remove # $FreeBSD$ from Makefiles.

x11-wm/subtle: fix build on GCC architectures

Base GCC doesn't build this port:
ruby.h: wrong number of arguments specified for 'deprecated' attribute

- Add USES=xorg
- Update WWW
- Pet portlint

Approved by:	portmgr blanket

Mark some ports failing on power64.  In cases where the error message
was a stub, provide a real one.

While here, pet portlint.

Approved by:	portmgr (tier-2 blanket)
Reported by:	swills

- Remove unused `shebangfix' from USES
- Delete interpreter shebang from file
  that is not meant to be executed and
  does not have executable permissions
- Don't use capital letter after colon

Add a port of subtle, grid-based manual tiling window manager.

WWW: http://subtle.subforge.org/