Players dying during GAME_PREPARING causes problems

[Maxi605]

There's a bug when somebody dies before the round starts they can be Traitor or Detective, if there's only people for 1 traitor to be alive and whoever died gets to be that traitor then the round is bugged without a traitor

[GuskiS]

There are 2 ways how to fix this:

1. Remove damage while gamemode is GAME_PREPARATION.
2. Add alive check to get_players within core.

1st is simplest one.
2nd requires quite a bit of work and testing and rethink for all the edge cases.

[Maxi605]

I think the second is the best way to do it, becouse removing damage doesn't block kill command or slay, there's others plugins to kill the player.