pygi-convert: Support new-style constructors for Gio.File
pygi-convert: Support new-style constructors for Gio.File

https://bugzilla.gnome.org/show_bug.cgi?id=698477

sfeltman/pygobject,sfeltman/pygobject,pexip/pygobject,davibe/pygobject,davibe/pygobject,davibe/pygobject,sfeltman/pygobject,davibe/pygobject,pexip/pygobject,GNOME/pygobject,GNOME/pygobject,pexip/pygobject,GNOME/pygobject