[Emoji] Replace CDN hosted twemoji svg images with COLR emoji font

[mvorisek]

Feature Request

Currently, emoji images are CDN hosted. This is a feature request extending https://github.com/fomantic/Fomantic-UI/issues/367.

The individual emoji svg images can be replaced with COLR font built by Mozilla https://github.com/mozilla/twemoji-colr.

Although COLR font format is pretty new according to https://caniuse.com/colr it is supported on the most devices already.

The twemoji-colr font contains all twemoji glyphs, thus no BC break. Also, the ttf font is only 1.4 MB is size compared to about 5 MB compressed size of the individual svg images. When converted to woff and woff2 formats for distribution, I belive the size will be even smaller.