Default formatting for `define-foo` forms

[jackfirth]

There's a lot of macros in my projects that fmt doesn't know how to format. But rather than developing some protocol for my macros to expose formatting instructions to fmt, it would be plenty fine for my purposes if fmt just made some assumptions based on the name of the macro. Specifically, I'd like any form whose name starts with define- and which fmt doesn't already understand to be formatted pretty much the same as define, plus support for keyword options with one argument after them. So this:

(define-refactoring-rule foo-rule #:description "does the foo thing" #:literals [foo] (foo a b) (foo b a))  

Can be assumed to be formattable like this:

(define-refactoring-rule foo-rule
  #:description "does the foo thing"
  #:literals [foo]
  (foo a b)
  (foo b a))

Almost all of my define-foo macros fit this pattern, and the ones that don't I'm willing to tweak to make them fit it.