In this new update mode, a set of base DATs can be used as a replacement naming scheme for the input DATs. Only the item names will be updated, so this willl not fill in additional hashes or the like.
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.