Support for polls/predictions/channel points/charity

[olivermrose]

Polls, predictions, and channel point events currently can't be implemented since they require an access token from the broadcaster.

• https://twitch.uservoice.com/forums/310213-developers/suggestions/43371027-allow-getting-realtime-updates-on-polls-prediction
• https://twitch.uservoice.com/forums/310213-developers/suggestions/43347684-allow-channel-moderators-to-control-polls-predicti

[olivermrose]

Charity events also included