Reworks pAIs (#68241)

A pretty heavy refactor for pAIs that just spilled into a rework.

Attempts to fully document and organize backend code.
Fixes a large number of bugs left untouched for a decade.
Breaks down the frontend into subcomponents.
Rebalances their software modules.
(should) fix pAI faces get removed if you activate them during alert #68242

code/modules/modular_computers/computers/item/computer.dm

@@ -78,7 +78,7 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 	var/datum/picture/saved_image // the saved image used for messaging purpose like come on dude
 
 	/// Stored pAI in the computer
-	var/obj/item/paicard/inserted_pai = null
+	var/obj/item/pai_card/inserted_pai = null
 
 /obj/item/modular_computer/Initialize(mapload)
 	. = ..()
@@ -661,11 +661,10 @@ GLOBAL_LIST_EMPTY(TabletMessengers) // a list of all active messengers, similar
 		return
 
 	// Insert a PAI.
-	if(istype(attacking_item, /obj/item/paicard) && !inserted_pai)
+	if(istype(attacking_item, /obj/item/pai_card) && !inserted_pai)
 		if(!user.transferItemToLoc(attacking_item, src))
 			return
 		inserted_pai = attacking_item
-		inserted_pai.slotted = TRUE
 		to_chat(user, span_notice("You slot \the [attacking_item] into [src]."))
 		return
 

code/modules/modular_computers/computers/item/computer_ui.dm

@@ -222,7 +222,6 @@
 				if("eject")
 					usr.put_in_hands(inserted_pai)
 					to_chat(usr, span_notice("You remove [inserted_pai] from the [name]."))
-					inserted_pai.slotted = FALSE
 					inserted_pai = null
 				if("interact")
 					inserted_pai.attack_self(usr)