Twitchapi

- 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"

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

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

- **Implemented EventSub**
- Marked Webhook as deprecated
- added the following new endpoints
- "Get Followed Streams"
- "Get Polls"
- "End Poll"
- "Get Predictions"
- "Create Prediction"
- "End Prediction"
- "Manage held AutoMod Messages"
- "Get Channel Badges"
- "Get Global Chat Badges"
- "Get Channel Emotes"
- "Get Global Emotes"
- "Get Emote Sets"
- "Delete EventSub Subscription"
- "Get Channel Stream Schedule"
- "Get Channel iCalendar"
- "Update Channel Stream Schedule"
- "Create Channel Stream Schedule Segment"
- "Update Channel Stream Schedule Segment"
- "Delete Channel Stream Schedule Segment"
- "Update Drops Entitlements"
- Added the following new AuthScopes
- USER_READ_FOLLOWS
- CHANNEL_READ_POLLS
- CHANNEL_MANAGE_POLLS
- CHANNEL_READ_PREDICTIONS
- CHANNEL_MANAGE_PREDICTIONS
- MODERATOR_MANAGE_AUTOMOD
- CHANNEL_MANAGE_SCHEDULE
- removed deprecated Endpoints
- "Create User Follows"
- "Delete User Follows"
- Added Topics to PubSub
- "AutoMod Queue"
- "User Moderation Notifications"
- Check if at least one of status or id is provided in get_custom_reward_redemption
- reverted change that made reward_id optional in get_custom_reward_redemption
- get_extension_transactions now takes up to 100 transaction ids
- added delay parameter to modify_channel_information
- made parameter prompt of create_custom_reward optional and changed parameter order
- made reward_id of get_custom_reward take either a list of str or str
- made parameter title, prompt and cost optional in update_custom_reward
- made parameter redemption_ids of update_redemption_status take either a list of str or str
- fixed exception in block_user
- allowed Twitch.check_automod_status to take in more that one entry

* Initializing the Twitch API now automatically creates a app authorization (can be disabled via flag)
* Made it possible to not set a app secret in cases where only user authentication is required
* added helper function `validate_token` to OAuth
* added helper function `revoke_token` to OAuth
* User OAuth Token is now automatically validated for correct scope and validity when being set
* added new "Get Drops Entitlement" endpoint
* added new "Get Teams" endpoint
* added new "Get Chattel teams" endpoint
* added new AuthScope USER_READ_SUBSCRIPTIONS
* fixed exception in Webhook if no Authentication is set and also not required
* refactored Authentication handling, making it more versatile
* added more debugging logs
* improved documentation

* added optional callback to Twitch for user and app access token refresh
* added additional check for non empty title in Twitch.modify_channel_information
* changed required scope of PubSub.listen_channel_subscriptions from CHANNEL_SUBSCRIPTIONS to CHANNEL_READ_SUBSCRIPTIONS