There was a recent change in the 7TV api that resulted in the `tags`
field returning null. The serializer currently doesn't handle `null`
cases so it was causing a deserialize error.
A simple fix is to make the field nullable, but I've decided to remove
it completely since it's not used anywhere in the app.
When deserialized, emotes have different fields with conflicting names
and extraneous fields. This new class allows for a common class that
prevents type errors.
