graphics/rubygem-image_processing: Add x11 and nox11 flavors

graphics/rubygem-image_processing: Update to 1.13.0

Changes:	https://github.com/janko/image_processing/blob/master/CHANGELOG.md

graphics/rubygem-image_processing: Change RUN_DEPENDS from rubygem-mini_magick
to rubygem-mini_magick4

- Bump PORTREVISION for dependency change

*: Bump PORTREVISIONs for math/mpc update to 1.3.1

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.

graphics: remove 'Created by' lines

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

  *  "Waitman Gobble" <uzimac@da3m0n8t3r.com>
  *  Aaron Dalton <aaron@FreeBSD.org>
  *  Abel Chow <ozsanh45vds001@sneakemail.com>
  *  Adam Weinberger <adamw@FreeBSD.org>
  *  Ade Lovett <ade@FreeBSD.org>
  *  Ade Lovett <ade@lovett.com>
  *  Akinori MUSHA aka knu <knu@idaemons.org>
  *  Aldis Berjoza <aldis@bsdroot.lv>
  *  Alex Hayward <xelah@xelah.com>
  *  Alex Ivasyuv <siegerstein@pochta.ru>
  *  Alex Samorukov <samm@os2.kiev.ua>

graphics/rubygem-image_processing: Update to 1.12.2

Changes:	https://github.com/janko/image_processing/blob/master/CHANGELOG.md

Remove # $FreeBSD$ from Makefiles.

Update to 1.12.1

Changes:	https://github.com/janko/image_processing/blob/master/CHANGELOG.md

Update to 1.12.0

Changes:	https://github.com/janko/image_processing/blob/master/CHANGELOG.md

Update to 1.11.0

Changes:	https://github.com/janko/image_processing/blob/master/CHANGELOG.md

Add rubygem-image_processing 1.10.3

ImageProcessing provides higher-level image processing helpers that are commonly
needed when handling image uploads.

This gem can process images with either ImageMagick/GraphicsMagick or libvips
libraries. ImageMagick is a good default choice, especially if you are migrating
from another gem or library that uses ImageMagick. Libvips is a newer library
that can process images very rapidly (often multiple times faster than
ImageMagick).

WWW: https://github.com/janko/image_processing