Allow root-level dependencies to be merged with target-level dependencies. #535
This does not merge actual lists of dependencies, but allows, for example, the root to delcare a package dependency and then allows each target to add custom repos to satisfy that dependency.
Another example may be a common set of runtime dependencies but have differing build dependencies per target without having to duplicate runtime deps to each target.
Full Changelog: v0.12.3...v0.12.5