0.6.0: major nav fixes - nav v4 support

Major Navigation Record support improvements

• data was misinterpreted because database description was automatically sorted by alphabetical order
• spare fields were not described properly, leading to key indexes to get shifted -> data misinterpretation
• NAV V4 support ✔️
• modern NAV frames support and efficient browsing
• new high level methods related to modern NAV frames

This release is possible thanks to @larsnaesbye contributions 👏