Fixes revolver paths, span classes, typo. Cleans exodus-1.dmm

Tweaks syringe gun and dart gun, renames syringe gun cartridges and makes them printable.
Adjusts penetration so that passing through mobs happens with a probability that scales with damage.
Adds a .45 signal pistol to the HoP's closet and a 9mm one to the mercenary shuttle.

code/modules/projectiles/projectile/bullets.dm

@@ -21,9 +21,8 @@
 
 	if(ismob(A))
 		if(iscarbon(A))
-			//squishy mobs absorb KE
-			if (damage <= 20) return 0
-			damage *= 0.7
+			if (damage <= 20 && !prob(damage)) return 0
+			damage *= 0.7 //squishy mobs absorb KE
 		return 1
 
 	if(istype(A, /obj/machinery) || istype(A, /obj/structure))

code/modules/projectiles/projectile/energy.dm

@@ -6,11 +6,12 @@
 	check_armour = "energy"
 
 
-//releases a very short burst of light on impact, mainly used to blind people
+//releases a burst of light on impact or after travelling a distance
 /obj/item/projectile/energy/flash
-	name = "shell" //a chemical filled shell or something
+	name = "chemical shell"
 	icon_state = "bullet"
 	damage = 5
+	kill_count = 15 //if the shell hasn't hit anything after travelling this far it just explodes.
 	var/flash_range = 0
 	var/brightness = 7
 	var/light_duration = 5