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

sysutils/hfsutils: Moved man to share/man

Approved by:    portmgr (blanket)

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: 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>

*/*: Remove redundant '-[0-9]*' from CONFLICTS

The conflict checks compare the patterns first against the package
names without version (as reported by "pkg query "%n"), then - if
there was no match - agsinst the full package names including the
version (as reported by "pkg query "%n-%v").

Many CONFLICTS definitions used patterns like "bash-[0-9]*" to filter
for the bash package in any version. But that pattern is functionally
identical with just "bash".

Approved by:	portmgr (blanket)

Remove # $FreeBSD$ from Makefiles.

- Update WWW

Approved by:	portmgr blanket

- Clarify LICENSE
- Add LICENSE_FILE
- Switch to options helpers
- Regenerate patches with `make makepatch`

Rename sysutils/ patch-xy patches to reflect the files they modify.

Stagify, cleanup Makefile, improve port description.

- Convert to USES=tk

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

There is a bug (misfeature?) in our make(1) with certain Makefiles, when the
build breaks once -jX is passed (with any X), e.g. for this port:

    cc ck_mdb.o ck_volume.o ck_btree.o hfsck.o util.o main.o ../suid.o
    ../version.o -L../libhfs -lhfs -o hfsck
    cc: ../suid.o: No such file or directory
    cc: ../version.o: No such file or directory
    *** Error code 1
    1 error
    *** Error code 2
    1 error
    ===> Compilation failed unexpectedly.

Reluctantly force GNU make(1) for the time being with corresponding comment.

Adjust CATEGORIES, allow to install developer libraries, improve TCLTK
option description while here.  The port now matches pkg-descr closely.

Move `emulators/hfsutils' to a more appropriate category (sysutils).