Removes spawn() from things I

- Removes from Sin of Greed slot machine (also cleans up the visible
message to make a difference between viewer and user)
- Removes from ferry request cooldown
- Removes from knock opening doors and closets

code/modules/shuttle/ferry.dm

@@ -20,5 +20,7 @@
 		cooldown = 1
 		usr << "<span class='notice'>Your request has been recieved by Centcom.</span>"
 		admins << "<b>FERRY: <font color='blue'>[key_name_admin(usr)] (<A HREF='?_src_=holder;adminmoreinfo=\ref[usr]'>?</A>) (<A HREF='?_src_=holder;adminplayerobservefollow=\ref[usr]'>FLW</A>) (<A HREF='?_src_=holder;secrets=moveferry'>Move Ferry</a>)</b> is requesting to move the transport ferry to Centcom.</font>"
-		spawn(600) //One minute cooldown
-			cooldown = 0
+		addtimer(src, "reset_cooldown", 600)
+
+/obj/machinery/computer/shuttle/ferry/request/proc/reset_cooldown()
+	cooldown = FALSE