New chat commands: !props and !thanks

New chat commands 🚀

!props 🙌 Give the current DJ's track some hype. One per person per play.

!thanks / !ty 🥂 If you're the DJ, toast everyone who propped that one.

We’re storing props against songs, so there’s room later to fold them into awards (most propped track, that kind of thing). Nothing’s decided yet, just something we can actually do now that the data’s there.

Go spin something and try it 🎶