Challenges UI

Older challenges seem to be overlooked by newer players. I’d like a “last played” column that you can sort challenges by so they get some use.

Also, some filters such as the player who posted the challenge and specific maps would be cool too.

Could you add some symbol to ID challenges that require some non-retail content so I can avoid them as well as a way to delete in the UI the ones I’ve already downloaded?

This would be useful.