Migrate testRunner to use nrepl, and clean up

Migrate connect, and add cljs support

send cljs stuff to the right repl

add pretty printing back to evaluate

Move paredit here

Bind paredit keys to Repl console

Jack-in

TODO lein
TODO shadow-cljs
TODO clj
TODO boot

Open new cljs repl

Ship first stab at repl?

Superclass repl-interactor, so it becomes DocMirror.

Move calva-fmt here.

Select toplevel forms etc, should use DocMirror.

Use our Paredit logic for calva proper.

Repl completions

Argument-based completions for vscode