Add safe check to PlayerStatFromPlayer

[Jettucis]

Noticed that sometimes there's System.IndexOutOfRangeException: Index was outside the bounds of the array error in this PlayerStat? PlayerStatFromPlayer(CCSPlayerController? player) so I'd suggest to add a safe-check.

PlayerStat? PlayerStatFromPlayer(CCSPlayerController? player)
{
    if(player == null || !player.IsLegal())
    {
        return null;
    }
    
    int slot = player.Slot;
    
    if (slot < 0 || slot >= playerStats.Length)
    {
	    Console.WriteLine($"Error: {player.PlayerName} slot {slot} is out of bounds. Array length is {playerStats.Length}.");
	    return null;
    }
    
    return playerStats[slot];
}

I would do a PR, but I did modify some other things, so that's a no option

[destoer]

Thanks ill take a look