cljr add use to ns

au Add "use" to namespace declaration

This used to add a (:use ) clause to the namespace declaration, but now it adds a (:require ) along with :refer. Then it gives you several tabstops to help you write your require statement:

• 1st tabstop lets you type out the namespace, the example in [example :refer [foo]]
• 2nd tabstop wraps the brackets in [foo], letting you type out :all if you want.
• 3rd tabstop is inside the brackets (just foo), where you name the inlined vars from your require.

Once you're through the tabstops, the cursor jumps back to where you were. If cljr-auto-clean-ns is true (the default), the namespace is cleaned up afterwards. Likewise for cljr-auto-sort-ns, which sorts it.