adding new features and fixing bugs

new introduction:

new treatments:

-- added if the player is the last and there is no one on the server except him and scp is given the role of training to end the game
-- added new config ISFFEnabled if on your server it is not possible to kill your own, then when you turn it on, only scp600 will be able to kill your own

correction

added processing when killing a player if his role is the same as that of our object, he will not be reassigned to the role that he already had
now the errors where the player became immortal and could exist in two instances at the same time, which could lead to server crashes, have been fixed, although they occurred in extremely rare cases