RFE: Dump widget tree as GtkBuilder

[Bastien Nocera]

Heya,

I've tested GtkParasite with apps that use hard-coded interfaces (eg.
written by hand), and it was very helpful in determining the hierarchy
of widgets.

A useful feature would be to be able to dump a selected widget tree into
a GtkBuilder file, meaning it would be easy to port applications to
using it.

Cheers