Allows bayonet removal (#5658)

You can now remove bayonets by using a crowbar on the gun.

Suggested by ths thread: https://forums.aurorastation.org/topic/10603-detatch-bayonets/

code/modules/projectiles/gun.dm

@@ -713,6 +713,12 @@ obj/item/weapon/gun/Destroy()
 		to_chat(user, "<span class='notice'>You attach \the [I] to the front of \the [src].</span>")
 		update_icon()
 
+	if(iscrowbar(I) && bayonet)
+		to_chat(user, "<span class='notice'>You detach \the [bayonet] from \the [src].</span>")
+		bayonet.forceMove(get_turf(src))
+		bayonet = null
+		update_icon()
+
 	if(!pin)
 		return ..()