feature: Scrape apktool unknowns and directories

[ddxv]

Not all code used in apps needs to be declared in AndroidManifest.xml so ultimately should use something like MobSF to scrape outgoing requests and libraries, but this would be very expensive.

In the meantime, it would be pretty easy to add support for apktool's 'unknown' and libraries. These are both already output into the apktool.yml file so very little extra effort to parse.

It would change the way that it is stored in the database though. Perhaps the best would be to store an entirely new table(s) for new data with the materialized views needing to be updated.