Android: extract style attributes for tabs

Task-number: QTBUG-39215
Change-Id: I727a12fa9696e22d3f31393a0fe2f9392afbfe45
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Accessibility: Add actions for value interfaces

To support increment / decrement of sliders, dials and spin boxes.
(anything with an {in,de}crementAction or a valueInterface.

Other platforms will follow the same pattern in follow-up patches.

Task-number: QTBUG-38832
Change-Id: Ie570acc39b3d9494a8bb9f624b61a398b1d8de89
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Windows a11y: Publish synthetic increase and decrease actions

Increase and decrease actions can be generally applied to any value
interface. We therefore make them available regardless of the
existence of any action interface.

Change-Id: I82ba01965dc869439b9d741ce681e0c0687263ca
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Accessibility Linux: Fix methods returning rects as iiii for AT-SPI

According to the spec rects get returned with iiii but we were directly
serializing QRect resulting in (iiii) as signature.
This would trip up Orca when trying to use flat review in text edits.

Task-number: QTBUG-39702
Change-Id: I8d6769688586e678d27cc4341de5176a91f057fc
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>