www/rubygem-rqrcode_core: Update to 2.1.0

Changes:	https://github.com/whomwah/rqrcode_core/releases

www/rubygem-rqrcode_core: Update version 2.0.0=>2.0.1

- Return to pool

Changelog: https://github.com/whomwah/rqrcode_core/releases/tag/v2.0.1

www/rubygem-rqrcode_core: Update version 1.2.0=>2.0.0

Changelog: https://github.com/whomwah/rqrcode_core/releases/tag/v2.0.0

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-rqrcode_core: New port

rqrcode_core is a library for encoding QR Codes in pure Ruby. It has a
simple interface with all the standard qrcode options. It was originally
adapted in 2008 from a Javascript library by Kazuhiko Arase.

Features:
* rqrcode_core is a Ruby only library. It requires no 3rd party
  libraries. Just Ruby!
* It is an encoding library. You can't decode QR Codes with it.
* The interface is simple and assumes you just want to encode a string
  into a QR Code, but also allows for encoding multiple segments.
* QR Code is trademarked by Denso Wave inc.

rqrcode_core is the basis of the popular rqrcode gem. This gem allows
you to generate different renderings of your QR Code, including png, svg
and ansi.

Sponsored by:	Nepustil