* enc/trans/EMOJI/*.src, enc/trans/emoji*, enc/x-emoji.c, test/ruby/enc/test_emoji.rb, tool/enc-emoji-citrus-gen.rb, tool/enc-emoji4unicode.rb, tool/jisx0208.rb, tool/test/test_jisx0208.rb: new encodings to support emoji charsets, which are used by Japanese mobile phones [ruby-dev:40528].  Thanks Yoji Shidara for a lot of contribution.
* tool/transcode-tblgen.rb: modified for enc-emoji4unicode.rb.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@26856 b2dd03c8-39d4-4d8f-98ff-823fe69b080e