Obsoleted constructor for QGraphicsItem

Removed the use of QGraphicsScene from the constructor argument.

Change-Id: I696417dc65db7b978ab35ae07a8f4d4e5b18c640
QtGui library -> include QtGui/* files directly

Change-Id: If348023b9caec26b63c69e257516fb89d494ec08
QWindowsStyle and QPlastiqueStyle obsoleted

Replaced with the Fusion style and the new QStyleFactory::create() API.

Change-Id: Icc89344182f76c07af93600308afac7762ff52ed