[PATCH] Boxed types in signal parameters

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The patch attached allows GOB2 to accept signal parameter types with the f=
orm BOXED=5F<BOXED=5FTYPE>, for instance: BOXED=5FGTK=5FTYPE=5FTREE=5FITER correctly g=
enerates signal code to marshal a (GtkTreeIter*) parameter.

The idea could be extended to also support boxed return types in signals.

This patch is backwards compatible with GOB 2.0.12.

-- bigthor

=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=

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