Merge: Nitpretty: make the tool more customizable

Added some options to control behavior.

Interesting features:

* option --break-strings to enable literal string breaks
* option --inline-do to enable do inlining
* option --skip-empty to enable empty line skipping

Pull-Request: #1088
Reviewed-by: Jean Privat <jean@pryen.org>
Reviewed-by: Alexis Laferrière <alexis.laf@xymus.net>
Reviewed-by: Lucas Bajolet <r4pass@hotmail.com>