Accessibility: Do not assert when a widget doesn't have a QAI

[ChangeLog][QtGui] Fixed crash when sending accessibility updates when
the corresponding widget does not have a corresponding
QAccessibleInterface. This showed on Mac for example with QStatusBar.

Task-number: QTBUG-35421
Change-Id: I94174e98e858b7a0122532ee5fcc8458a263bccd
Reviewed-by: Jan Arve Sæther <jan-arve.saether@digia.com>
Fix some typos in documentation.

Fix some spelling and grammatical errors in comments that show up in Qt documentation. No changes to code.

Change-Id: I2e946fda0bd9a2117f8e9b2fb300df9bf0a98a6c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Topi Reiniö <topi.reinio@digia.com>
Android: Don't show ActionBar at startup.

Task-number: QTBUG-35151

Change-Id: Ie62e50032aaa647a86c4f03b1a3363e5ef6a1bbb
Reviewed-by: Eskil Abrahamsen Blomfeldt <eskil.abrahamsen-blomfeldt@digia.com>