Introduce cycle privacy refactoring command

[rrudakov]

Before submitting a PR mark the checkboxes for the items you've done (if you
think a checkbox does not apply, then leave it unchecked):

• The commits are consistent with our contribution guidelines.
• You've added tests (if possible) to cover your change(s). Bugfix, indentation, and font-lock tests are extremely important!
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Thanks!

[bbatsov]

What about other var defining forms like:

• definline
• defrecord
• defmacro
• defmulti

I think they all work with private metadata.

[rrudakov]

What about other var defining forms like:

• definline
• defrecord
• defmacro
• defmulti

I think they all work with private metadata.

Hmm, I didn't think about it, honestly, since clojure-mode supports only def and defn. Let me try to add those as well.

[rrudakov]

What about other var defining forms like:

• definline
• defrecord
• defmacro
• defmulti

I think they all work with private metadata.

Done.