filesystems: add new category for file systems and related utilities

The filesystems category houses file systems and file system utilities.
It is added mainly to turn the sysutils/fusefs-* pseudo-category into
a proper one, but is also useful for the sundry of other file systems
related ports found in the tree.

Ports that seem like they belong there are moved to the new category.
Two ports, sysutils/fusefs-funionfs and sysutils/fusefs-fusepak are
not moved as they currently don't fetch and don't have TIMESTAMP set
in their distinfo, but that is required to be able to push a rename
of the port by the pre-receive hook.

Approved by:	portmgr (rene)
Reviewed by:	mat
Pull Request:	https://github.com/freebsd/freebsd-ports/pull/302
PR:		281988

MANPREFIX: eliminate usage of MANPREFIX

While here move some manpages to share/man

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.

sysutils/zfs-snapshot-mgmt: use pkg-message to show message on remove

sysutils: remove 'Created by' lines

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

  *  <jsmith@resonatingmedia.com>
  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Aaron Landwehr <aaron@snaphat.com>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Adrian Chadd
  *  Adrian Chadd <adrian@FreeBSD.org>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Alan Eldridge <alane@FreeBSD.org>
  *  Alan Eldridge <alane@geeksrus.net>
  *  Aldis Berjoza <aldis@bsdroot.lv>
  *  Alex Deiter <alex.deiter@gmail.com>

all: Remove all other $FreeBSD keywords.

Remove # $FreeBSD$ from Makefiles.

sysutils/zfs-snapshot-mgmt: pass to submitter

Pass the maintainership of sysutils/zfs-snapshot-mgmt to the submitter.

PR:		249196
Submitted by:	John Darrah
Event:		September 2020 Bugathon

Convert to UCL & cleanup pkg-message (categories s)

sysutils/zfs-snapshot-mgmt: convert to USES=shebangfix

- Add NO_ARCH
- Switch to @sample

Stage support

Assign back to the pool.

Requested by:	maintainer via mail

Add NO_STAGE all over the place in preparation for the staging support (cat:
sysutils)

- Bump PORTREVISION
- Fix ruby shebang lines

PR:             ports/160969
Submitted by:   h h <aakuusta@gmail.com>
Approved by:    maintainer timeout (marius@nuenneri.ch ; 102 days)

- Unbreak for Ruby 1.9

PR:             162763
Submitted by:   Jan Beich <jbeich@tormail.net>
Approved by:    maintainer timeout

- Get Rid MD5 support

- Fix errors when dealing with the root data set

PR:             prots/140811
Submitted by:   Anonymous <swell.k@gmail.com>
Approved by:    maintainer timeout (1.5 months)

- Respect NOPORT*

PR:             140045
Submitted by:   Anonymous <swell.k@gmail.com>
Approved by:    maintainer

- Reset maintainer per his request on ports@
- Pass maintainership to Marius Nünnerich <marius (AT) nuenneri.ch>

- Update to 20090201

PR:             ports/131258
Submitted by:   Marcin Simonides <marcin AT studio4plus.com> (maintainer)
Approved by:    miwi (mentor)

A simple script for automatic ZFS snapshot creation and removal of stale
ones.

PR:             ports/125340
Submitted by:   Marcin Simonides <marcin@studio4plus.com>