* Extract reorder logic into function
* Save download queue everytime a download was finished
The download queue was never saved after a download was finished.
This caused finished download to be restored on a server start, which caused unnecessary "downloads" which most of the time would just finish immediately since the pages were still in the cache
* Wait for download queue save process to be finished
Since multiple downloaders could be finished at the same time, the download queue should be saved synchronously
* Remove unnecessary download queue save trigger
This gets called everytime a downloader finished downloading all chapters of its source.
Since the queue is now saved everytime a download is finished, this is trigger is not needed anymore
schroda
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