Holodeck refactor and Enchancements

Moves holodeck code to modules/holodeck.  Repaths holodeck structures a little.  Cleans holodeck code and prepares for additional features (multiple holodecks, etc).  Should fix #4828.

Necessary map bugfixen for Asteroid, Disc, Dream, Meta, and TG.
Adds Lounge, Emergency Medical, pet center, and holdout room to the rec holodeck.

All items spawned by the holodeck will do only stamina damage, except when emagged.  This allows emergency medical to be staffed with scalpels and bonesaws and such.  Emergency medical has some functioning equipment but the only drugs available are in the sleeper.

code/game/objects/items/toys.dm

@@ -732,6 +732,7 @@
 	icon_state = "deck_nanotrasen_full"
 	w_class = 2
 	var/cooldown = 0
+	var/obj/machinery/computer/holodeck/holo = null // Holodeck cards should not be infinite
 	var/list/cards = list()
 
 /obj/item/toy/cards/deck/New()
@@ -769,6 +770,8 @@
 		user << "<span class='warning'>There are no more cards to draw!</span>"
 		return
 	var/obj/item/toy/cards/singlecard/H = new/obj/item/toy/cards/singlecard(user.loc)
+	if(holo)
+		holo.spawned += H // track them leaving the holodeck
 	choice = cards[1]
 	H.cardname = choice
 	H.parentdeck = src