Status of multicolor fonts?

[Clément Pit--Claudel]

Hi emacs-devel,

Multicolor fonts seem to be becoming popular, especially for representing 
Emoji. There seems to be four competing standards to encode them (see 
http://blog.symbolset.com/multicolor-fonts for info and links). Both Apple and 
Microsoft distribute at least one such color Emoji font (Apple Color Emoji and 
Segoe UI Emoji). Google also has one, Noto Emoji, which is free as in beer and 
speech. Mozilla will release one soon, and so will the Emoji One project.

IIUC, Emacs on OSX can display at least some of these fonts properly. What is 
the status on other platforms? Is it dependent on the graphical toolkit with 
which Emacs is compiled?

For reference, here's a sample:

> 😀 😬 😁 😂 😃 😄 😅 😆 😇 😉 😊 🙂 🙃 ☺️ 😋 😌 😍 😘 😗 😙 😚 😜 😝
> 😛 🤑 🤓 😎 🤗 😏 😶 😐 😑 😒 🙄 🤔 😳 😞 😟 😠 😡 😔 😕 🙁 ☹️ 😣 😖
> 😫 😩 😤 😮 😱 😨 😰 😯 😦 😧 😢 😥 😪 😓 😭 😵 😲 🤐 😷 🤒 🤕 😴

Cheers,
Clément.

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