[API Design] Download component without getLink method

[stefanseifert]

the download component model seems to be the only model that was not switched to the new Link concept. is this component obsolete, or is it an oversight?

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this discussion is taken over from the mailing list where it did not gather any attention (except from @ky940819).

[jckautzmann]

Introducing a Link getLink() to the Download component model would be a breaking change. We will introduce this change with the future v2 version.