QGraphicsAnchorLayout: cleaning up AnchorData

Use just one constructor for AnchorData and tweak the struct when
necessary. Also use the function refreshSizeHints() for Normal anchors
to get the item information instead of passing to the constructor.

This has the advantage that we don't need to replicate the code for
checking and updating the size hint and size policies. Note that the
code before only considered the size policies after the first
refreshSizeHints() -- which we know will be called after the
simplification, so the assumption seems to be correct, but we don't
depend on that anymore..

Signed-off-by: Caio Marcelo de Oliveira Filho <caio.oliveira@openbossa.org>
Reviewed-by: Eduardo M. Fleury <eduardo.fleury@openbossa.org>

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