Toggleable twitch tiered emote integration.

Recently, discord decided it was time to remove the "feature" that all tier 1 twitch subs could use all tiered emotes.
This abrupt decision has left many people wanting a toggle, where the streamer can decide whether or not any tier can use all tiered sub.

Technicalities:
- Option within twitch integration for allowing all tiers to use all emotes. (like how it was before)