Improve script init times

Now loads as soon as possible, and doesn't wait for chat to load.
Changed init interval times to exponentially get larger which results in
only ~12 checks over 102s instead of ~250 checks over 60s.
Add logic for containment on `resizable` Fixes #9
Implement a "news" service

Allows me to send periodic updates to users who have this script
running. Messages will appear in the Twitch chat and will stay hidden
once you click the "Dismiss" button for each message.
Version bump v0.5.4