feat(itemOrder): insert timestamps to objects from older saves

ext/Server/ProjectManager.lua

@@ -310,8 +310,12 @@ function ProjectManager:SaveProjectCoroutine(p_ProjectHeader)
 	-- TODO: get the GameObjectSaveDatas not from the transferdatas array, but from the GO array of the GOManager. (remove the GOTD array)
 	for _, l_GameObject in pairs(GameObjectManager.m_GameObjects) do
 		if l_GameObject:IsUserModified() == true or l_GameObject:HasOverrides() then
+			local s_Object = l_GameObject
+			if not s_Object.timeStamp then
+				s_Object.timeStamp = SharedUtils:GetTimeMS()
+			end
 			s_Count = s_Count + 1
-			table.insert(s_GameObjectSaveDatas, GameObjectSaveData(l_GameObject):GetAsTable())
+			table.insert(s_GameObjectSaveDatas, GameObjectSaveData(s_Object):GetAsTable())
 		end
 	end