Adds a new smite: Retcon, also refactors the temporary_atom component into an atom level proc (#90016)

## About The Pull Request

Adds a new Retcon smite, it makes the person fade out into nothingness
with a configurable timer, deletes their records and reopens their job
slot, as if they were never there at all.

I was also annoyed that to play around with temporary_atom I had to
slowy add a component, and it doesn't really have much of a reason to BE
a component, so I refactored it into an atom level proc called
fade_into_nothing

## Why It's Good For The Game

The smite is useful for when you wanna get rid of someone who had to
leave roundstart and whatnot, on top of just being funny. the refactor
is also good because i can now put that proc on build mode and go to
town.

## Changelog

🆑
add: Added new mechanics or gameplay changes
add: Added more things
del: Removed old things
qol: made something easier to use
balance: rebalanced something
fix: fixed a few things
sound: added/modified/removed audio or sound effects
image: added/modified/removed some icons or images
map: added/modified/removed map content
spellcheck: fixed a few typos
code: changed some code
refactor: refactored some code
config: changed some config setting
admin: messed with admin stuff
server: something server ops should know
/🆑

---------

Co-authored-by: Jacquerel <hnevard@gmail.com>

code/modules/modular_computers/file_system/programs/virtual_pet.dm

@@ -584,7 +584,7 @@ GLOBAL_LIST_EMPTY(virtual_pets_list)
 	announce_global_updates(message = "has found a chocolate at [selected_area.name]")
 	selected_area = null
 	var/obj/item/food/virtual_chocolate/chocolate = new(get_turf(computer))
-	chocolate.AddElement(/datum/element/temporary_atom, life_time = 30 SECONDS) //we cant maintain its existence for too long!
+	chocolate.fade_into_nothing(life_time = 30 SECONDS) //we cant maintain its existence for too long!
 
 /datum/computer_file/program/virtual_pet/proc/recall_pet(mob/living/friend)
 	animate(pet, transform = matrix().Scale(0.3, 0.3), time = 1.5 SECONDS)