* Added a lot of tests
* More tests! Added a Parser.NormalizePath to normalize all paths within Kavita.
* Fixed a bug where MarkChaptersAsUnread implementation wasn't consistent between different files and lead to extra row generation for no reason.
* Added more unit tests
* Found a better implementation for Natural Sorting. Added tests and validate it works. Next commit will swap out natural Sort for new Extension.
* Replaced NaturalSortComparer with OrderByNatural.
* Drastically simplified and sped up FindFirstEntry for finding cover images in archives
* Initial fix for a epub bug where metadata defines key as absolute path but document uses a relative path. We now have a hack to correct for the epub.
