The biggest change is that structs and properties now provide their own name,
which is needed when we want to write everything back to a file. Also a bunch of
reorganization of stuff I didn't understand before.
This adds a macro that helps deserialize structs when their properties &
types are known ahead of time. It's sole job is gluing different binrw
macros together so I don't have to.
The nice thing about this is that you have more direct access to the
underlying data.
