Twitchapi

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- `Twitch.get_channel_info` now also optionally accepts a list of strings with up to 100 entries for the `broadcaster_id` parameter

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- Added the following new endpoints:

- "Get Chat Settings"

- "Update Chat Settings"

- Added Auth Scope "channel:manage:chat_settings"
- Fixed error in Auth Scope "channel:manage:schedule"
- Fixed error in Endpoint "Get Extension Transactions"
- Removed unusable Webhook code

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- Fixed bug that prevented EventSub subscriptions to work if main threads asyncio loop was already running

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- EventSub and PubSub callbacks are now executed non blocking, this fixes that long running callbacks stop the library to respond to heartbeats etc.
- EventSub subscription can now throw a TwitchBackendException when the API returns a Error 500
- added the following EventSub topics (thanks d7415!)

- "Goal Begin"

- "Goal Progress"

- "Goal End"

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- Fixed EventSub not keeping local state in sync on unsubscribe
- Added proper exception if authentication via oauth fails

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- EventSub now uses a random 20 letter secret by default
- EventSub now verifies the send signature

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