Make buttons respond to accessible press.
Make buttons respond to accessible press.

QML accessibility looks for and calls accessiblePressAction
when a Press action is received.

Change-Id: I53779ba0f6833fde3d593ee5ac6a4106fd9d3521
Reviewed-by: J-P Nurmi <b84a892f57a298bb5dae653b4e188948a84d5549@digia.com>

mizukusak/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,kobolabs/qtquickcontrols,richardmg/qtcomponents,richardmg/qtcomponents,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,drgvond/qtquickcontrols,kobolabs/qtquickcontrols,mizukusak/qtquickcontrols