King Of The Gem game mode, Infinite Brambles variant

- King Of The Gem is similar to Last Man Standing, but with an additional objective: a Gem. Anyone who holds this for 5 seconds wins the round without having to engage in any combat. But of course, that means making yourself the primary target for all other players! And even if one manages to take down their opponents, they still have to grab the Gem... if you put your Bramble or Laser arrows in just the right places, you might be able to prevent your enemies from getting the prize!
- Infinite Brambles is what it says on the tin. Brambles never decay unless they are burning.

Both of these are not playtested, because I don't have friends I can just order to come here to test video games, but I think the mode is complete enough to pass on. Maybe you guys can play a couple rounds.
I think it might be really fun to play KOTG with the Trigger Corpses or Return As Ghosts variants, trying to keep the last man standing from getting to the Gem, or the Infinite Brambles variant, forcing whoever wants to grab the Gem to navigate through them carefully.
Given your override of `CheckForAllButOneDead`, isn't this dead code?