Implement accessible text interface

Change-Id: I3a9143c61ecda98513be031fc554fd4bfcef7b7c
Reviewed-by: Michael Bruning <michael.bruning@digia.com>
Implement accessible value interface

Change-Id: I837d7f3041aec59ae83c0fe802bc83b746e62b76
Reviewed-by: Andras Becsi <andras.becsi@digia.com>
Fix interpretation of ARIA Application role

Setting the Qt role Application will lead Qt to returning the qApp
accessible representation. Instead make it a document.

Change-Id: Id0b0a3462115905664b8147ab7d529bae7e4fa4b
Reviewed-by: Andras Becsi <andras.becsi@digia.com>
Reviewed-by: Michael Bruning <michael.bruning@digia.com>
Fix crash when accessibility queries bounds on startup

On startup we may not yet have an accessibility manager.
Change-Id: I9fda09c20de40ed3c8fb7108fd0314a789eb50f5
Reviewed-by: Andras Becsi <andras.becsi@digia.com>
Reviewed-by: Michael Bruning <michael.bruning@digia.com>