* Refactored updating chapter metadata from ComicInfo into the Scan loop. This let's us avoid an additional N file reads (expensive) in the metadata service, as we already have to read them in the scan loop.
* Refactored Series level metadata aggregation into the scan loop. This allows for the batching of DB updates to be much smaller, thus faster without much overhead of GC.
* Refactored some of the code for ProcessFile to remove a few redundant if statements
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