* Asserts and cstruct exceptions are removed in favor of result
* Parse separately and don't emit `RESERVED_FIRST` mft_entry
* Add .mli file exposing types, pretty printers and `query_manifest`
* mft_entry.b, mft_entry.u are runtime fields. We expect them to be
zeroed.
* add a type mft with version and mft_entries
* add pretty printers a la solo5-elftool query-manifest