Add emoji support

[misterupkeep]

Render emoji with Twemoji, and add a emoji picker component

[misterupkeep]

@00drip I'll handle the emoji picker component once you add Twemoji

[lukediamond]

@misterupkeep v-textarea strangely enough does not have contents. I cannot see the text/emojis in the element whatsoever in devtools. Twemoji depends on having DOM access to the element to swap glyphs for images, so there's no way to use twemoji within the actual message field right now.

[misterupkeep]

Once again, vuetify comes short 🙄
Maybe there's a workaround to get it working, but I'd like to lower our dependency surface against a library which we've already had to replace bits of