Server changes

* The saferoom door can now be cracked earlier if more than 60% of the living Survivors are near the door.

* When the BonuxBox is active, there is a chance to get an adrenaline effect for 15 seconds when killing Bosses.

* Minor fixes and code optimizations.

* Now players with NoSteam cannot connect to the last 2 slots (excluding the VIP slot).