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.

devel: remove 'Created by' lines

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

  *  "Waitman Gobble" <uzimac@da3m0n8t3r.com>
  *  <jkoshy@FreeBSD.org>
  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Aaron Dalton <aaron@daltons.ca>
  *  Aaron H. K. Diep <ahkdiep@gmail.com>
  *  Aaron Hurt <ahurt@anbcs.com>
  *  Abel Chow <abel_chow@yahoo.com>
  *  Adam McLaurin
  *  Adam Saponara <as@php.net>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Ade Lovett <ade@FreeBSD.org>

Remove # $FreeBSD$ from Makefiles.

devel/ruby-setup.rb: convert to USES=shebangfix

MASTER_SITES cleanup.

- Replace ${MASTER_SITE_FOO} with FOO.
- Merge MASTER_SITE_SUBDIR into MASTER_SITES when possible. (This means 99.9%
  of the time.)
- Remove occurrences of MASTER_SITE_LOCAL when no subdirectory was present and
  no hint of what it should be was present.
- Fix some logic.
- And generally, make things more simple and easy to understand.

While there, add magic values to the FESTIVAL, GENTOO, GIMP, GNUPG, QT and
SAMBA macros.

Also, replace some EXTRACT_SUFX occurences with USES=tar:*.

Checked by:	make fetch-urlall-list
With hat:	portmgr
Sponsored by:	Absolight

Cleanup plist

Add OPTIONS_DEFINE=DOCS for ports with %%PORTDOCS%% in the plist.

Where possible, correct a few instances where PORTDOCS was being used
to flag stuff in EXAMPLESDIR. For some ports, mostly those owned by
ruby@, PORTDOCS is applied to pretty much everything whether it's
documentation or example.

- Stage support

Add NO_STAGE all over the place in preparation for the staging support (cat:
devel part 4)

- Remove Author line

- Use single space after WWW:

-remove MD5

- Assign all unmaintained ruby ports to ruby@,
  so people will know where to send questions to.

- Update to 3.4.1

- Add some SHA256 checksums

With portmgr hat on, reset maintainership of knu's ports since he has
been inactive more than 6 months.  We hope to see him back sometime.

- Fix runtime (File.pwd -> Dir.pwd)

PR:             ports/81816
Submitted by:   IWATSUKI Hiroyuki <don@na.rim.or.jp>
Approved by:    maintainer timeout (18 days)

Update to 3.3.1.

Update to 3.2.3.

Update to 3.2.2.

Update to 3.2.0.

Update to 3.1.5.

Update to 3.1.4.

De-pkg-comment.

Update WWW and the author email.

Remove http://www.ruby-lang.org/~knu/backup/ from MASTER_SITES, now
that bsd.ruby.mk adds a backup site to MASTER_SITE_BACKUP.

Use RUBY_MOD*.

- Install install.rb and setup.rb as libraries again.

- Install a slightly patched version of the scripts that work
  stand-alone under ${PREFIX}/bin/ prefixing `ruby-'.

Update to 3.1.2.

Install install.rb and setup.rb into ${PREFIX}/bin since they are not
really libraries but common installer scripts.

The backup site directory has been moved.    

The master site is down right now, so provide an alternative site.    

Update MASTER_SITES.    

Update to 2.2.1.    

Update to 2.1.0.    

Add ruby-setup.rb, a common installer script for ruby packages.