Implementation of pkg_install library and database routines in Rust.
The initial goals are to fully support existing pkg_install packages and the files-based pkgdb, in tandem with developing pm, a Rust alternative to pkg_install and pkgin.
After that the aim is to replace the fragile and slow pkgdb backend with sqlite which should provide much faster and more reliable queries and updates.
Module supporting the package database. WIP.
Packing list parsing and generation.
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