Implement a flat recursive resolver#264

Draft

daniel-brosche wants to merge 5 commits intomainfrom

feature/flat_flat-recursive_resolver

Commits on Jun 15, 2021

initial version of the flat & flat-recursive resolver
Daniel Brosche
committed

Commits on Jun 24, 2021

implement flat recursive lock
Daniel Brosche
committed
initial support of flat-recursive* update, lock and install
Daniel Brosche
committed

Commits on Jun 25, 2021

fix linter issues
Daniel Brosche
committed
fix a couple of tests due to the introduced resolver-field
Daniel Brosche
committed