Add support for colored unicode emojis

https://github.com/ikatyang/emoji-cheat-sheet/blob/master/README.md

Basic support working.

To add support for colored emoji we could check:
- https://github.com/samhocevar/emoji.wpf
- https://github.com/DebugST/emoji-svg-render
- https://github.com/googlefonts/noto-emoji