SCP Restoration

fixed crash occuring on human 'protect' goal;
humans will avoid taking fall damage;
humans guarding a position will attack Chaos Insurgency soldiers;
humans can be healed by food (by half of its nutrition);
added combined protect + assist task to humans;
removed the need for hand to be empty to open human interaction screen;
5 % chance for a male human to spawn with 30 health;
humans won't attack their owner if hit;
Chaos Insurgency soldiers will despawn on peaceful mode;
fixed human weapon preference;
humans are able to use Trident;
fixed SCP-999's model and texture;
added a command for human to drop current weapon.