[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/boxes_magazines/internal/_internal.dm

@@ -0,0 +1,7 @@
+/obj/item/ammo_box/magazine/internal
+	desc = "Oh god, this shouldn't be here"
+	flags_1 = CONDUCT_1|ABSTRACT_1
+
+//internals magazines are accessible, so replace spent ammo if full when trying to put a live one in
+/obj/item/ammo_box/magazine/internal/give_round(obj/item/ammo_casing/R)
+	return ..(R,1)