Move quickdwm example to examples/winextras directory, too.

Change-Id: Ic3fa14cf2e22e55ebf2aa10c8725b3d1a6569679
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>
Small fixes in QJumpList and QWinTaskbarButton.

Use default icon if toHICON() fails. Use qPrintable() to output errors.

Change-Id: I114a753ef34ab5ef6336995067ac11ec9baf17af
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Jake Petroules <jake.petroules@petroules.com>