NanoUI caching for cameras/crew manifest

code/game/objects/effects/datacore-effect.dm

@@ -132,10 +132,11 @@ using /obj/effect/datacore/proc/manifest_inject( ), or manifest_insert( )
 */
 
 var/global/list/PDA_Manifest = list()
+var/global/ManifestJSON
 
 /obj/effect/datacore/proc/get_manifest_json()
 	if(PDA_Manifest.len)
-		return PDA_Manifest
+		return
 	var/heads[0]
 	var/sec[0]
 	var/eng[0]
@@ -206,5 +207,6 @@ var/global/list/PDA_Manifest = list()
 		"bot" = bot,\
 		"misc" = misc\
 		)
-	return PDA_Manifest
+	ManifestJSON = list2json(PDA_Manifest)
+	return
 

code/game/objects/items/devices/PDA/PDA.dm

@@ -467,7 +467,7 @@ var/global/list/obj/item/device/pda/PDAs = list()
 				data["convo_job"] = sanitize(c["job"])
 				break
 	if(mode==41)
-		data["manifest"] = data_core.get_manifest_json()
+		data_core.get_manifest_json()
 
 
 	if(mode==3)
@@ -499,12 +499,15 @@ var/global/list/obj/item/device/pda/PDAs = list()
 			data["aircontents"] = list("reading" = 0)
 
 
+	data["manifest"] = list("__json_cache" = ManifestJSON)
+	
 	// update the ui if it exists, returns null if no ui is passed/found
 	ui = nanomanager.try_update_ui(user, src, ui_key, ui, data, force_open)
 	if (!ui)
 		// the ui does not exist, so we'll create a new() one
         // for a list of parameters and their descriptions see the code docs in \code\modules\nano\nanoui.dm
 		ui = new(user, src, ui_key, "pda.tmpl", title, 630, 600)
+
 		// when the ui is first opened this is the data it will use
 		ui.set_initial_data(data)
 		// open the new ui window