Merge SSnanoui & Nanomanager (#2427)

Merges the NanoUI subsystem with Nanomanager, as well as cleans up some nanomanager code.
Most of the files in this commit are changed as a result of removing the nanomanager global in favor of the SSnanoui global.

code/modules/modular_computers/file_system/programs/generic/news_browser.dm

@@ -32,7 +32,7 @@
 	if(download_progress >= loaded_article.size)
 		downloading = 0
 		requires_ntnet = 0 // Turn off NTNet requirement as we already loaded the file into local memory.
-	nanomanager.update_uis(NM)
+	SSnanoui.update_uis(NM)
 
 /datum/computer_file/program/newsbrowser/kill_program()
 	..()
@@ -82,7 +82,7 @@
 		. = 1
 		show_archived = !show_archived
 	if(.)
-		nanomanager.update_uis(NM)
+		SSnanoui.update_uis(NM)
 
 
 /datum/nano_module/program/computer_newsbrowser
@@ -121,7 +121,7 @@
 		data["all_articles"] = all_articles
 		data["showing_archived"] = PRG.show_archived
 
-	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
+	ui = SSnanoui.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
 		ui = new(user, src, ui_key, "news_browser.tmpl", "NTNet/ExoNet News Browser", 575, 700, state = state)
 		ui.auto_update_layout = 1

code/modules/modular_computers/file_system/programs/generic/ntnrc_client.dm

@@ -222,7 +222,7 @@
 				)))
 		data["all_channels"] = all_channels
 
-	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
+	ui = SSnanoui.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
 		ui = new(user, src, ui_key, "ntnet_chat.tmpl", "NTNet Relay Chat Client", 575, 700, state = state)
 		ui.auto_update_layout = 1

code/modules/modular_computers/file_system/programs/generic/nttransfer.dm

@@ -134,7 +134,7 @@ var/global/nttransfer_uid = 0
 			)))
 		data["servers"] = all_servers
 
-	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
+	ui = SSnanoui.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
 		ui = new(user, src, ui_key, "ntnet_transfer.tmpl", "NTNet P2P Transfer Client", 575, 700, state = state)
 		ui.auto_update_layout = 1