Because the DATabase stuff has been removed, Mappings no longer have a use. These had a lot of time and effort put into them so they'll be preserved in previous releases. But they have no further use here.
This is a purge of dead and unused code. The major thing with this is the removal of all original DATabase features. They might be resurrected in the future but , for now, it would need a full rewrite to make sense. Nobody uses it either, so it shouldn't be missed.
This effectively doesn't do much for the time being since there's only one "Dat type" that's being used. Realistically, this is probably the best bet since a given DAT should not be restricted to an output type as much as an ItemType is bound to its data. This also removes the experimental classes that won't be in use for forever. More work still might need to be done but it is unknown at this point.
This massive change replaces the old "Rom" struct system with a new one that have different objects for each major item type. This required a lot of work and a lot of changes and has unfortunately been untested. But this is the first step in moving away from using structs. The next major step is converting Dat over to this as well.
Taking a cue from RomVault and GordonJ, I'm including the Zlib code as converted by DotNetZip as well as creating a couple slightly more maleable structures for writing archives.
All things that have to do with DAT mappings are in Mappings now and eveything having to do with header skippers are in Skippers now. Also, Skippers got proper implementations of matching a file to a rule and applying a rule to a file.
