Sort the checksum: urls dictionary via the url, so that no matter
where the urls came from (import or any dep-solve section), the
checksum: url dict is the same for the same set of urls.
Add support for additional paths that are searched when trying to
load a manifest. Currently only the path of the manifest that has
the include is searched. With this changed additional directories
will be included after that, in the order they were given ton the
command line.
Both v1 and v2 code paths used the same logic to add the resolved
dependencies to the `source_urls` dict, which is already stored
in the base class. Move the logic into the base class too.
Rewrite image pre-processor to single tool so that it is easier to use.
Now also supports `ignore-weak-deps` when dep-solving and supports
relative paths for local files.
Also create a symlink to the osbuild package, so that the tools can be
run from the source checkout and have access to the osbuild package.
