The fixup_app_name/1 change notably supports packages like proper-1.1.1-beta.
This allows you to turn on debug infor for all the beam packages in the system with a single change at the top level. This is required for debugging and dialyzer work. It also allows you to switch it on on a package by package basis.
cleanup up the code quite a bit in the bootstrapper
This moves rebar3-nix-bootstrap from its own repository to rebar3. Its a single file and this vastly reduces the complexity of making changes.
