Misc PDA code improvements (#70555)

* How to conflict with PRs: A guide

* Removes unnecessary support for the now-removed job disks from Tablet's TGUI menu, and tablet's ui_act.
* Adds autodoc comments to computer files
* Removes the unused 'unsendable' var on computer files
* Generally improves code on tablets, now process isn't looping through every idle thread twice!
* Moves the check for program in idle_threads above checking if supported by hardware, because it's already running, so there's no need to check.

* eh

* revert a scipaper change

code/modules/modular_computers/file_system/program.dm

@@ -203,8 +203,8 @@
 		var/obj/item/computer_hardware/card_slot/card_holder = computer.all_components[MC_CARD]
 		if(card_holder)
 			ID = card_holder.GetID()
-		generate_network_log("Connection closed -- Program ID: [filename] User:[ID?"[ID.registered_name]":"None"]")
-	return 1
+		generate_network_log("Connection closed -- Program ID: [filename] User:[ID ? "[ID.registered_name]" : "None"]")
+	return TRUE
 
 /datum/computer_file/program/ui_interact(mob/user, datum/tgui/ui)
 	ui = SStgui.try_update_ui(user, src, ui)
@@ -248,7 +248,6 @@
 				if(user && istype(user))
 					computer.ui_interact(user) // Re-open the UI on this computer. It should show the main screen now.
 
-
 /datum/computer_file/program/ui_host()
 	if(computer.physical)
 		return computer.physical