cargo: Move all conversions in _raw_to_dataclass()

This allows keeping the manifest unmodified which is better practice for
a parser. Previously some places had e.g. raw.setdefault().

It also fix some values:
- BuildTarget.doc_scrape_examples is removed. It seems to be some
  experimental cargo feature, but I haven't found documentation that
  says it should be part of the manifest. It was also missing from raw
  manifest.
- BuildTarget.edition does not default to 2015, it default to package's
  edition, which itself default to 2015.
- bench value defaults to False for tests.
- Dependency.path must be relative to its Cargo.toml location. If the
  value comes from the package it can be used as-is, but if it comes
  from workspace it must be made relative.
- Library.name default to its package name with dash replaced with
  underscores.

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