Feature request: Add a endpoint to allows players to leave a matchmaking room they have previously joined.

[BillTheBeast]

What do you want to see in the API?

POST
/matchmaking/rooms/leave

How do you think this should work?

• This should remove the player from the matchmaking room they currently are in.
• As they can only be in one room there is no need to specify which room.
• If the player is the last player in the room the room is closed and deleted.
• If the player is the room owner and there is another player(s) in the room a new owner is chosen of those still in the room.