[MIRROR] Splits projectiles into different files for readability (#5800)

* Splits projectiles into different files for readability

* Update tgstation.dme

* I love how the dme cleans itself up

code/modules/projectiles/projectile/bullets/dnainjector.dm

@@ -0,0 +1,24 @@
+/obj/item/projectile/bullet/dnainjector
+	name = "\improper DNA injector"
+	icon_state = "syringeproj"
+	var/obj/item/dnainjector/injector
+	damage = 5
+	hitsound_wall = "shatter"
+
+/obj/item/projectile/bullet/dnainjector/on_hit(atom/target, blocked = FALSE)
+	if(iscarbon(target))
+		var/mob/living/carbon/M = target
+		if(blocked != 100)
+			if(M.can_inject(null, FALSE, def_zone, FALSE))
+				if(injector.inject(M, firer))
+					QDEL_NULL(injector)
+					return TRUE
+			else
+				blocked = 100
+				target.visible_message("<span class='danger'>\The [src] was deflected!</span>", \
+									   "<span class='userdanger'>You were protected against \the [src]!</span>")
+	return ..()
+
+/obj/item/projectile/bullet/dnainjector/Destroy()
+	QDEL_NULL(injector)
+	return ..()