change lib/unicode_normalize/tables.rb to single item per line to make diffs shorter

        * template/unicode_norm_gen.tmpl: Change formatting of output to produce only a
          single item (or range) for each line to make future diffs shorter and easier
          to understand and check.

        * lib/unicode_normalize/tables.rb: output of the above

        update to Unicode Version 12.1.0 (beta)

        Unicode Version 12.1.0 adds one single character, U+32FF SQUARE ERA NAME REIWA,
        for the new Japanese era starting on May 1st. 12.1.0 will be finalized only on
        May 7th, so we go with the beta version because further changes in the data we
        need are highly unlikely, and we want to make sure Ruby is ready for the new era.

        * common.mk: change UNICODE_VERSION to 12.1.0, UNICODE_BETA to YES

        * enc/unicode/12.1.0, enc/unicode/12.1.0/casefold.h, enc/unicode/12.1.0/name2ctype.h:
          add directory and generated data files for new version

        * lib/unicode_normalize/tables.rb: update for new character

        * test/ruby/test_regexp.rb: add test for character property age=12.1

        * test/test_unicode_normalize.rb: add test for NFKC decomposition of new character

        This (mostly) completes issue #15195.

        remove Unicode 12.0.0 related directory and generated files


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67525 b2dd03c8-39d4-4d8f-98ff-823fe69b080e