[Enchancement] When adding to download queue sort by chapter number

[luigi311]

When you manually select multiple chapters to download, add them in ascending order by chapter number. It looks like right now it will download downward from the selected list so the order is from the latest chapter to the oldest chapter, the download order would make more sense to make it oldest chapter to latest chapter. This will allow the users to read through as chapters are downloaded instead of having to wait until everything is downloaded since you cant read any chapter pass the one you are currently on.