Bools and returns super-pr (#53221)

Replaces like 70-80% of 0 and such, as a side effect cleaned up a bunch of returns
Edit: Most left out ones are in mecha which should be done in mecha refactor already
Oh my look how clean it is

Co-authored-by: TiviPlus <TiviPlus>
Co-authored-by: Couls <coul422@gmail.com>

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

@@ -13,8 +13,8 @@
 	tgui_id = "NtosNetDownloader"
 
 	var/datum/computer_file/program/downloaded_file = null
-	var/hacked_download = 0
-	var/download_completion = 0 //GQ of downloaded data.
+	var/hacked_download = FALSE
+	var/download_completion = FALSE //GQ of downloaded data.
 	var/download_netspeed = 0
 	var/downloaderror = ""
 	var/obj/item/modular_computer/my_computer = null
@@ -36,33 +36,33 @@
 
 /datum/computer_file/program/ntnetdownload/proc/begin_file_download(filename)
 	if(downloaded_file)
-		return 0
+		return FALSE
 
 	var/datum/computer_file/program/PRG = SSnetworks.station_network.find_ntnet_file_by_name(filename)
 
 	if(!PRG || !istype(PRG))
-		return 0
+		return FALSE
 
 	// Attempting to download antag only program, but without having emagged/syndicate computer. No.
 	if(PRG.available_on_syndinet && !emagged)
-		return 0
+		return FALSE
 
 	var/obj/item/computer_hardware/hard_drive/hard_drive = computer.all_components[MC_HDD]
 
 	if(!computer || !hard_drive || !hard_drive.can_store_file(PRG))
-		return 0
+		return FALSE
 
 	ui_header = "downloader_running.gif"
 
 	if(PRG in main_repo)
 		generate_network_log("Began downloading file [PRG.filename].[PRG.filetype] from NTNet Software Repository.")
-		hacked_download = 0
+		hacked_download = FALSE
 	else if(PRG in antag_repo)
 		generate_network_log("Began downloading file **ENCRYPTED**.[PRG.filetype] from unspecified server.")
-		hacked_download = 1
+		hacked_download = TRUE
 	else
 		generate_network_log("Began downloading file [PRG.filename].[PRG.filetype] from unspecified server.")
-		hacked_download = 0
+		hacked_download = FALSE
 
 	downloaded_file = PRG.clone()
 
@@ -71,7 +71,7 @@
 		return
 	generate_network_log("Aborted download of file [hacked_download ? "**ENCRYPTED**" : "[downloaded_file.filename].[downloaded_file.filetype]"].")
 	downloaded_file = null
-	download_completion = 0
+	download_completion = FALSE
 	ui_header = "downloader_finished.gif"
 
 /datum/computer_file/program/ntnetdownload/proc/complete_file_download()
@@ -83,7 +83,7 @@
 		// The download failed
 		downloaderror = "I/O ERROR - Unable to save file. Check whether you have enough free space on your hard drive and whether your hard drive is properly connected. If the issue persists contact your system administrator for assistance."
 	downloaded_file = null
-	download_completion = 0
+	download_completion = FALSE
 	ui_header = "downloader_finished.gif"
 
 /datum/computer_file/program/ntnetdownload/process_tick()
@@ -105,20 +105,20 @@
 
 /datum/computer_file/program/ntnetdownload/ui_act(action, params)
 	if(..())
-		return 1
+		return TRUE
 	switch(action)
 		if("PRG_downloadfile")
 			if(!downloaded_file)
 				begin_file_download(params["filename"])
-			return 1
+			return TRUE
 		if("PRG_reseterror")
 			if(downloaderror)
-				download_completion = 0
-				download_netspeed = 0
+				download_completion = FALSE
+				download_netspeed = FALSE
 				downloaded_file = null
 				downloaderror = ""
-			return 1
-	return 0
+			return TRUE
+	return FALSE
 
 /datum/computer_file/program/ntnetdownload/ui_data(mob/user)
 	my_computer = computer
@@ -186,7 +186,7 @@
 
 /datum/computer_file/program/ntnetdownload/kill_program(forced)
 	abort_file_download()
-	return ..(forced)
+	return ..()
 
 ////////////////////////
 //Syndicate Downloader//
@@ -199,7 +199,7 @@
 	filedesc = "Software Download Tool"
 	program_icon_state = "generic"
 	extended_desc = "This program allows downloads of software from shared Syndicate repositories"
-	requires_ntnet = 0
+	requires_ntnet = FALSE
 	ui_header = "downloader_finished.gif"
 	tgui_id = "NtosNetDownloader"
 	emagged = TRUE