Add ability to export list of "Favorites" from app

Our team has been trying to coordinate what sessions each other are watching, along with what ones we deem as high-priority to get information from.

It would be amazing if there was a feature that allowed for exporting your list of favorited events. Possibly to a json or text file. Importing would be a nice to have, but less critical IMO.

Thanks for all the great work. Love the app!
