* Trigger download ahead while reading client side
* Trigger download ahead while reading earlier
Download ahead was only triggered once the chapter got marked as read
* Optionally ignore dupe chapters for download ahead
* Consider current chapters scanlator for dupe check
* Update download ahead related settings
- add new metadata setting for download ahead limit
- previous setting
- rename
- update usage (auto download new chapters limit)
* Select chapter to auto delete while reading depending on ignore dupe setting
Currently, the n-th to last chapter always got deleted ignoring if "ignore dupes" setting was enabled or not.
* Only auto delete chapter while reading if it is read
In case not the last read but the n-th to last read chapter should get auto deleted while reading, it currently just got deleted ignoring if it has been read or not.
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