Update support for Unicode 15.1

Upgrade to start using Unicode 15.1 emojis. Note that while 16.0 was just released, noto-emoji doesn't yet support it. Various things start breaking without the proper fallback images, and it's better to wait until 16 is a little more prevalent.

• load the Unicode emoji-test.txt file as the main basis for emoji data
• load the gemojione data, adding as aliases
• load any additional aliases

Closes #28 (closed)

lib/tanuki_emoji/db/emoji_data.rb

@@ -6,5 +6,6 @@ module TanukiEmoji
     UNICODE_DATA_DIR = "vendor/unicode/#{UNICODE_VERSION}"
 
     EmojiData = Struct.new(:codepoints, :property, :version, :range_size, :examples, :description)
+    EmojiTestData = Struct.new(:codepoints, :qualification, :emoji, :version, :description, :group_category)
   end
 end