Automagical deps.edn support for clojure-library

[arrdem]

It'd be convenient - at least while Katamari isn't completely to parity with the clojure tool - to be able to keep your deps.edn file around and have the clojure-library target pseudo-constructor magically sort out that it should be getting its :deps (and potentially :aliases / :profiles if we ever support those) from the deps.edn file in the same dir as the Rollfile.

Maybe supporting this sort of multi-addressing is just a quick way to get into a real mess but it's an interesting thought.