Menu: Properly relay enabled state to QPA menu object

Task-number: QTBUG-39384
Change-Id: I1b71912b4f35ea0aa9e06667a5c0ecedec30f980
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
TableView: Allow resizing and scrolling single-column tables

Also makes sure the resize handle is visible in desktop style.

Task-number: QTBUG-39393
Change-Id: I44410c65e76b0a3221ea5fce713c1f1b69079947
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>