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

www/rubygem-sinatra-r18n: Change RUN_DEPENDS from rubygem-sinatra to
rubygem-sinatra2

- Bump PORTREVISION for dependency change

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.

www/rubygem-sinatra-r18n: Update to 5.0.2

Changes:	https://github.com/r18n/sinatra-r18n/blob/master/ChangeLog.md

www/rubygem-sinatra-r18n: Update to 5.0.1

- Update WWW

Changes:	https://github.com/r18n/sinatra-r18n/blob/master/ChangeLog.md

Remove useless Created by: headers mentioning me

Remove # $FreeBSD$ from Makefiles.

Update to 4.0.0

Changes:	https://github.com/r18n/r18n/blob/master/ChangeLog.md

Update version requirement of RUN_DEPENDS

Update to 3.2.0

- Reformat pkg-descr
- Update WWW

Changes:	https://github.com/r18n/r18n/blob/master/ChangeLog.md

Update to 3.1.2

Changes:	https://github.com/ai/r18n/blob/master/ChangeLog.md

Take maintainership

Update to 3.0.5

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 3.0.3

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 3.0.2

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 3.0.1

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 3.0.0

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 2.2.0

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 2.1.8

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 2.1.7

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 2.1.6

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Update to 2.1.5

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

www/rubygem-sinatra-r18n: update to 2.1.4

Convert USES=gem:autoplist to USES=gem since autoplist is default

create USES=gem and update rubygem- ports to use it

Note that for now ports still have to have USE_RUBY=yes to use USES=gem

PR:		209041
Differential Revision:	https://reviews.freebsd.org/D6070

Remove ${PORTSDIR}/ from dependencies, categories v, w, x, y, and z.

With hat:	portmgr
Sponsored by:	Absolight

- Update to 2.1.3

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

- Update to 2.1.2
- Add LICENSE_FILE

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md
Sponsored by:	PortsCamp Taiwan

- Update to 2.1.0

Changes:	https://github.com/ai/r18n/blob/master/r18n-core/ChangeLog.md

Set NO_ARCH for remaining rubygem-* ports with no arch dependent files

Obtained from:  DEVELOPER_MODE
With Hat:       ruby@

Sponsored by:   RideCharge Inc / Curb

- Update to 2.0.4

Changes:	https://github.com/ai/r18n/commits/master/sinatra-r18n

- Update to 2.0.3
- Add LICENSE
- Sort RUN_DEPENDS

Changes:	https://github.com/ai/r18n/commits/master/sinatra-r18n

www/rubygem-sintra-r18n: update to 1.1.11

- Add stage support

A Sinatra extension that provides i18n support to translate your
web application. It is just a wrapper for R18n core library. It has
nice Ruby-style syntax, filters, flexible locales, custom loaders,
translation support for any classes, time and number localization,
several user language support, agnostic core package with out-of-box
support for Rails, Sinatra and desktop applications.

WWW: https://github.com/ai/r18n/tree/master/sinatra-r18n