Removes AI and Charge parts from tablets, adds support for more later. (#70012)

* Removes recharger tablet parts

Removes 'advanced' tablet subtypes that we used before PDAs were added, in some jobs.
Replaces Roboticist's advanced tablet mail with a laptop
Moves the notepad's note var from the tablet, to the note app
Moves modular computer's defines into their own file

Machine computers now directly use power from the machine they're in, while the rest uses power cells.
Silicon tablets don't use power at all.

Co-authored-by: san7890 <the@san7890.com>
Co-authored-by: Mothblocks <35135081+Mothblocks@users.noreply.github.com>

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

@@ -2,7 +2,7 @@
 //TODO: REFACTOR THIS SPAGHETTI CODE, MAKE IT A COMPUTER_HARDWARE COMPONENT OR REMOVE IT
 /obj/item/modular_computer/processor
 	name = "processing unit"
-	desc = "You shouldn't see this. If you do, report it."
+	desc = "An advanced computer." //modular PCs examine us
 	icon = null
 	icon_state = null
 	icon_state_unpowered = null
@@ -50,12 +50,3 @@
 	..()
 	machinery_computer.update_appearance()
 	return
-
-/obj/item/modular_computer/processor/attack_ghost(mob/user)
-	ui_interact(user)
-
-/obj/item/modular_computer/processor/alert_call(datum/computer_file/program/caller, alerttext)
-	if(!caller || !caller.alert_able || caller.alert_silenced || !alerttext)
-		return
-	playsound(src, 'sound/machines/twobeep_high.ogg', 50, TRUE)
-	machinery_computer.visible_message(span_notice("The [src] displays a [caller.filedesc] notification: [alerttext]"))