Long live QHVContainer!

Various places in Qt use arrays indexed by some function of
Qt::Orientation input. None document their dependence on the numerical
values of the Qt::Orientation enum, some waste space, none is
type-safe.

QHVContainer is a private container of two values, one for
Qt::Horizontal and one for Qt::Vertical. Its salient API is the
indexing operator, taking Qt::Orientation, thus making the class
type-safe.

Use it to port QGridLayoutItem and QAbstractScrollAreaPrivate.

Change-Id: I0d9f17431a5eb141bfb0763c83155710bb82a537
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
Reviewed-by: Giuseppe D'Angelo <giuseppe.dangelo@kdab.com>

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