Christmas code changes (#41763)

* Christmas code changes

🆑 coiax
add: Santa can now examine presents to see what's inside.
del: Santa no longer has a mass summon presents spell, because of his
new regenerating bag!
add: Santa's bag regenerates presents as long as Santa is holding it.
balance: You can only find one gift under a christmas tree per round, no
matter how many trees you search.
balance: Santa's teleport does not announce where he's going.
fix: Fixed Santa not having a full head and beard of white hair.
fix: Fixed Santa not being genetically white-haired.
fix: Fixed Concentrated Barber's Aid not growing extreme amounts of
hair.
/🆑

The `box` var has been moved down from `/datum/outfit/job` to
`/datum/outfit`.

Added unlimited christmas tree with presents, for testing.

Santa's restriction against opening presents is now done by
TRAIT_CANNOT_OPEN_PRESENTS. Santa's ability to see inside presents is
done by the TRAIT_PRESENT_VISION, which also determines if Santa's Bag
will regenerate presents every 30 to 60 seconds.

Santa no longer starts with a breath mask and O2 tank, but instead has
an internals box. Santa no longer has a no-access gold ID, he can
teleport from room to room!

Gifts determine what type is inside them on initialization, rather than
when unwrapped.

- Reasoning -

Unlike last year, there are various possible methods of accessing
christmas trees spawners, allowing for an unlimited number of anything
presents. Cutting down the presents to one per round regardless of tree
count will avoid this.

Santa should be able to see what he's giving, because then he can reward
the naughty and nice children with different gifts.

* Missed a merge

* Adds present investigate logs, and visible messages

* Use the body+mind checking of mob.has_trait

* Less globals, more static vars on types; also event renaming

code/game/objects/structures/flora.dm

@@ -63,7 +63,13 @@
 	icon_state = "pinepresents"
 	desc = "A wondrous decorated Christmas tree. It has presents!"
 	var/gift_type = /obj/item/a_gift/anything
-	var/list/ckeys_that_took = list()
+	var/unlimited = FALSE
+	var/static/list/took_presents //shared between all xmas trees
+
+/obj/structure/flora/tree/pine/xmas/presents/Initialize()
+	. = ..()
+	if(!took_presents)
+		took_presents = list()
 
 /obj/structure/flora/tree/pine/xmas/presents/attack_hand(mob/living/user)
 	. = ..()
@@ -72,14 +78,21 @@
 	if(!user.ckey)
 		return
 
-	if(ckeys_that_took[user.ckey])
+	if(took_presents[user.ckey] && !unlimited)
 		to_chat(user, "<span class='warning'>There are no presents with your name on.</span>")
 		return
 	to_chat(user, "<span class='warning'>After a bit of rummaging, you locate a gift with your name on it!</span>")
-	ckeys_that_took[user.ckey] = TRUE
+
+	if(!unlimited)
+		took_presents[user.ckey] = TRUE
+
 	var/obj/item/G = new gift_type(src)
 	user.put_in_hands(G)
 
+/obj/structure/flora/tree/pine/xmas/presents/unlimited
+	desc = "A wonderous decorated Christmas tree. It has a seemly endless supply of presents!"
+	unlimited = TRUE
+
 /obj/structure/flora/tree/dead
 	icon = 'icons/obj/flora/deadtrees.dmi'
 	desc = "A dead tree. How it died, you know not."