* Code cleanup.
When copying files, if the target file already exists, append (1), (2), etc onto the file (this is enhancing existing implementation to allow multiple numbers)
* Added a ton of null checks to UpdateSeriesMetadata and made the code work on the rare case (not really possible) that SeriesMetadata doesn't exist.
* Updated Genre code to use strings to ensure a better, more fault tolerant update experience.
* More cleanup on the codebase
* Fixed a bug where Series SortName was getting emptied on file scan
* Fixed a bad copy
* Fixed unit tests
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