Emoji 4.0+ sequences support

[Crissov]

The Unicode standard itself #59 only covers codepoints and their attributes, e.g. Emoji and Emoji_Presentation. All kind of character sequences that shall result in a single emoji glyph rendering are defined in Unicode® Technical Report (soon: Standard) # 51 Unicode Emoji. This includes the following:

• presentations
  • applicable emoji followed by either Variation Selector 15 (text) or 16 (emoji)
• flags
  • an Emoji Flag Sequence is a valid pair of Regional Identifier Symbol Letters (RIS), according to CLDR's implementation of ISO 3166-1
  • an Emoji Tag Sequence for ISO 3166-2 code elements (soon)
  • an Emoji ZWJ Sequence (only Rainbow Flag currently)
• skin tones (Emoji Modifier Sequence)
  • applicable base followed by Fitzpatrick modifier
• genders and professions (Emoji ZWJ Sequence)
  • profession emoji base followed by gender symbol (Female = Venus or Male = Mars, possibly soon Neutral/Ambiguous/Androgynous = Mercury)
  • human emoji base (Man or Woman, possibly soon Adult) followed by profession symbol

Emoji 4.0 released on 22 November 2016 added several sequences that most implementations now support (including iOS since version 10.2 #69 released in December 2016): emoji-data.txt. It also switched to English CLDR short names (usually in lowercase or with initial caps) that may differ from the immutable character names in Unicode (usually in uppercase or with initial caps), e.g. red heart vs. HEAVY BLACK HEART for :heart:.

Emoji 5.0 will add more sequences around the same time Unicode 10.0 will be released, due in June 2017.

PR #72 changes the Unicode source files accordingly to support Emoji 3.0 and 4.0, but is probably not enough on its own.

[iamcal]

PR #78 is working on this

[iamcal]

now done in v2.5.0