Whether or not a pacifist can fire a gun is no longer based on the gun being harmful, but the chambered round being harmful (#36670)

fix: makes dragnet non harmful
tweak: pacifists can now use any disabler or stun setting on any energy gun
code: removed all of the pacifism check code from code/modules/mob/living/living.dm
code: gun objects no longer have a harmful variable, instead, ammo_casing objects now have a harmful variable, which is by default set to TRUE
code: if a pacifist fires a gun, it checks whether or not the round chambered is lethal, instead of whether or not the gun itself is lethal.

code/modules/projectiles/ammunition/caseless/foam.dm

@@ -6,6 +6,7 @@
 	icon = 'icons/obj/guns/toy.dmi'
 	icon_state = "foamdart"
 	var/modified = 0
+	harmful = FALSE
 
 /obj/item/ammo_casing/caseless/foam_dart/update_icon()
 	..()
@@ -32,6 +33,7 @@
 	else if (istype(A, /obj/item/pen))
 		if(modified)
 			if(!FD.pen)
+				harmful = TRUE
 				if(!user.transferItemToLoc(A, FD))
 					return
 				FD.pen = A