Integrate Youtube feed

[Saborknight]

Have Heimdall send a message everytime a Youtube video is uploaded by whitelisted channels.

Perhaps have it scan the title too, just incase people upload non-Arma videos?

[Saborknight]

Research done so far:
https://gist.github.com/methdev/2e82914189c072231855002ccd21f18c
https://developers.google.com/youtube/v3/guides/push_notifications
https://pubsubhubbub.appspot.com/subscribe