Refactor modular computer (and application) attackby into item_interaction (#84245)

## About The Pull Request

Sooooooooo I was recently notified of an issue (#84185) that popped up
from me replacing the `attackby(...)` chain on id cards, where it's no
longer possible to put money into IDs inside of PDAs by slapping it
against the PDA.
As I expected, this is because modular computers both still use
`attackby(...)`, and would call `attackby(...)` on the ID they contained
if hit with cash.

https://github.com/tgstation/tgstation/blob/24a23009e8ee4d056b6671c70c41feab1a18590b/code/modules/modular_computers/computers/item/computer.dm#L799
Now this could've been an easy one line no-gbp fix where I just replace
it with a direct call to `insert_money(...)` on the ID and call it a
day!
But hey. Might as well get rid of the `attackby(...)` altogether while
we're at it.


First off, because the `attackby(...)` proc was getting quite bloated,
we split off all the specific item behaviours into `[X]_act(...)` type
procs to clean it up.
We then make those return item interaction flags, so we can call them on
`item_interaction(...)` after the right typecheck passes and immediately
return their results.
This also involves replacing the `application_attackby(...)` on
applications with an `application_item_interaction(...)`, and making it
return the item interaction flags too.

The code of each subsection isn't significantly different, though
reorganized a bit in some cases.
Like inserting a computer disks now tries to move it into the computer
_first_ before swapping out whichever disk is already in there, so it
doesn't swap out the disk if putting the new one in fails.
## Why It's Good For The Game

Fixes #84185.
Having more stuff be updated to the proper `item_interaction(...)`
system is cool and good.

code/modules/modular_computers/file_system/programs/maintenance/modsuit.dm

@@ -17,12 +17,10 @@
 		unsync_modsuit()
 	return ..()
 
-/datum/computer_file/program/maintenance/modsuit_control/application_attackby(obj/item/attacking_item, mob/living/user)
-	. = ..()
-	if(!istype(attacking_item, /obj/item/mod/control))
-		return FALSE
-	sync_modsuit(attacking_item, user)
-	return TRUE
+/datum/computer_file/program/maintenance/modsuit_control/application_item_interaction(mob/living/user, obj/item/tool, list/modifiers)
+	if(istype(tool, /obj/item/mod/control))
+		sync_modsuit(tool, user)
+		return ITEM_INTERACT_SUCCESS
 
 /datum/computer_file/program/maintenance/modsuit_control/proc/sync_modsuit(obj/item/mod/control/new_modsuit, mob/living/user)
 	if(controlled_suit)