Include hidden headers in trees and tables consistently

There was a disagreement between the a11y plugin and QTreeView
whether the horizontal header should have been exposed or not.
When the header was hidden, this resulted in that we sent an event
with a child id that was wrong, or in worst case higher than
QAI::childrenCount(). This was the reason we got the warning
output as described in the task.

With this commit, we consistently *expose* hidden headers both for
QTreeView and QTableView, but ensure that their state().invisible is
set to true instead.
This makes it consistent with how hidden cells are exposed.

This also fixes a bug in QTableViewPrivate::accessibleTable2Index
where we always added 1 to the index, which was spotted while
writing the test.

Task-number:  QTBUG-33247

Change-Id: Ifd1f83d56296dd071424fdb81fce7628bc24fe0a
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>
Split QQnxWindow into QQnxEglWindow and QQnxRasterWindow

Change-Id: I2fb4096ccca54fa6631aa16c9b8d1308b0a6b918
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Rafael Roquetto <rafael.roquetto@kdab.com>
Reviewed-by: Thomas McGuire <thomas.mcguire@kdab.com>
Reviewed-by: Kevin Krammer <kevin.krammer@kdab.com>
qdoc: Documentation for property groups is back

This bug was marked fixed and closed, but I'm not sure
it was ever completely fixed. The qdoc commands for QML
property groups were not being processed, so although
the property group and its sub-properties appeared on
the page, the documentation text for the property
group and its properties was never written to the HTML
file. This has been corrected with this update.

Task-number: QTBUG-32341
Change-Id: I5b33ab512a53456379c52236496fb7bc74850842
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>