Undo-Redo support patch (updated for gio)

[BROCCO Amos <amos brocco unifr ch>]

Hello,
I've updated my previous patch for undo-redo support to work with GIO.
I've made a patch available on bugzilla (https://bugzilla.gnome.org/show_bug.cgi?id=167501#c34) against Nautilus 2.28.1.

It supports Undo-Redo for the following operations:
   - copy / duplicate
   - move
   - trash
   - rename
   - make link
   - create new folder
   - create new file
   - create file from template

I've tried to touch the existing code (mainly nautilus-file-operations.c) as
little as possible. 

Testing, reviews and comments are greatly appreciated!!!