Gtk::VariantIter replacement

[Povietkin Konstantin <povetkin k gmail com>]

Gtk::VariantIter is useful only for classes, which are derived from
Gtk::VariantContainerBase class. Has not it more sense to make
Gtk::VariantIter more STL-styled?

For example:
Gtk::VariantContainerBase::iterator iter;
Gtk::VariantContainerBase::const_iterator const_iter;

In my opinion current usage of Gtk::VariantIter is useful only for
non-OOP languages.
Am I wrong?

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