Allow kicking of dead players

[tux314159]

Closes #20083.

This PR lets admins kick defeated players from the game. This is needed because some bad sports cause lag or reveal info about the game after they have lost, ruining the game for everyone else. ~~I also removed the no-kick-game-started thing because it doesn't seem to be very useful (there's no way for the admin to kick undefeated players anyway); this was needed as it was not letting the admin kick players even if they had lost.~~

EDIT: I updated it to allow kicking of defeated players too.

[tux314159]

(Closes #20083)

[PunkPun]

Needs a rebase now that #20100 was merged

[tux314159]

What I need to do is: align the kick buttons right?

[PunkPun]

No, everything is aligned you should just rebase to upsteam/bleed

[tux314159]

Alright I've rebased on top of bleed

[PunkPun]

Closing as superseded by #20521