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/programs/configurator.dm

@@ -7,11 +7,10 @@
 	filedesc = "Hardware Configuration Tool"
 	extended_desc = "This program allows configuration of computer's hardware"
 	program_icon_state = "generic"
-	unsendable = 1
-	undeletable = 1
+	undeletable = TRUE
 	size = 4
-	available_on_ntnet = 0
-	requires_ntnet = 0
+	available_on_ntnet = FALSE
+	requires_ntnet = FALSE
 	tgui_id = "NtosConfiguration"
 	program_icon = "cog"
 

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

@@ -3,7 +3,6 @@
 	filedesc = "NT Software Hub"
 	program_icon_state = "generic"
 	extended_desc = "This program allows downloads of software from official NT repositories"
-	unsendable = TRUE
 	undeletable = TRUE
 	size = 4
 	requires_ntnet = TRUE

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

@@ -7,7 +7,6 @@
 	program_icon_state = "command"
 	requires_ntnet = FALSE
 	available_on_ntnet = FALSE
-	unsendable = TRUE
 	undeletable = TRUE
 	usage_flags = PROGRAM_TABLET
 	size = 5