Emoji reactions

Requires develop backend that supports latest emoji reaction format.

This MR does:

• add new reactions with unicode emoji
• use search to filter through the emoji or pick one of the "common" ones
• click on existing reactions to add your own or remove it

This MR doesn't:

• have notifications for reactions
• update emoji reactions in real time

This MR should still:

• limit the amount of reactions shown per status

src/components/emoji_reactions/emoji_reactions.js

@@ -4,16 +4,13 @@ const EmojiReactions = {
   props: ['status'],
   computed: {
     emojiReactions () {
-      console.log(this.status.emoji_reactions)
       return this.status.emoji_reactions
     }
   },
   methods: {
     reactedWith (emoji) {
-      // return []
       const user = this.$store.state.users.currentUser
       const reaction = this.status.emoji_reactions.find(r => r.emoji === emoji)
-      console.log(reaction)
       return reaction.accounts && reaction.accounts.find(u => u.id === user.id)
     },
     reactWith (emoji) {