Implemented bit emotes

[zneix]

Pull request checklist:

• CHANGELOG.md was updated, if applicable

Description

This pull request adds support for "Tabbing" and picking Bit emotes from emote picker menu. Also works with the "colon-emote-picker". To get this to work, we make a request to the Ivr API directly from chatterino - maybe I will have to redo it to make a request via chatteirno/api, however I didn't want to complicate things this much. Currently, emotes are refreshed every 10 minutes in TwitchEmotes::loadUserstateEmotes.

Little To-Do

• Reload bit emotes on F5
  if there'll be any need for that, may be a part of another PR
  - [ ] Move emoteset fetching to chatteirno/api explained below
• Decide whether or not to refresh emotes periodically
  decided this is fine

Would close #1450 #2183 #2388

[zneix]

As for caching emotes in chatterino/api, I think this is not needed since for regular emotes, we make a direct Kraken call and then contact chatterino/api only to get emote set data, (example). We also contact Ivr API to get emote data, however it already gives us info which we would normally need to request via chatterino/api, so I think it's fine as it is now.
Maybe, we can in the future move the call for emtoes in general to chatterino/api, but that's out of scope of the current pull request.