Similar to the migration of splitting DatFile into ifferent subtypes, this makes sure that logic that petains to each "type" of file that's used by SabreTools, be it an input/output archive format or a specialty file format that is treated by itself like CHDs, is in tis own namespace. ArchiveTools has been pared down accordingly and all "factory" logic should make it easier to add more formats in the future with little fuss.
This DOES group some kinds of DAT due to their inherently similar nature. TSV and CSV are under the same "SeparatedValue" umbrella, and all of the SFV, MD5, SHA1, etc are under Hashfile because they're nearly identical. This is just the first stage change, making everything static and making them reference the DatFile separately.
