Add some automated ringing

[sprunk]

If the battleroom changes status from ingame to not-ingame, if you are on the list of players but aren't yourself ingame, get pinged. This is similar to !notify, but automated and doesn't require infra support. People who are not ingame are most likely waiting for the game, but with the game minimized and doing something else. We can assume those who are ingame were watching/playing and are aware the game is over so no need to bother them with extra pings.

Also, if the player changes status from being in the room's waiting list to being on the list of playing players, passively (via someone else leaving), ring. This is also detectable without infra help.