New Qt4 "Graphics View" Workspace Fix:
Fix to aborting a selected Object Icon Move by hitting the ESC key.
Checked in to RiverWare 5.1 development on 2-25-2009

The first implementation ran into a Qt 4.3.3 bug related to cancelling the 
QGraphicsItem Mouse Grab.  The problem is described on this QtCentre webpage: 
http://www.qtcentre.org/forum/showthread.php?t=19050&referrerid=6743

The new implementation overrides the effect of a mouse drag-move after 
the ESC key is clicked, until the mouse button is released (i.e. without 
cancelling the grab).  It replaces the position value of icon position-
change events with the pre-drag-move position.

-----------------
SimObjGfxItem.cpp
SimObjGfxItem.hpp
-----------------

New overridden virtual methods from QGraphicsItem:
  virtual void keyPressEvent (QKeyEvent*);
  virtual QVariant itemChange (QGraphicsItem::GraphicsItemChange, 
                               const QVariant&);

SimObj GraphicsItem Icon Move processing via QGraphicsItem virtual method
implementations:
 
  Mouse Press Event: 
    Record All Pre-Move Icon Positions.

  Mouse Release Event:
    If (Abort Drag-Move Mode) OR (Any Icon Out of Bounds)
      Restore Selected Obj Pre-Move Icon Positions, and save to model.
    CANCEL Abort Drag-Move Mode.

  Mouse Move Event:
    Save Selected-Item Positions to Model.

  Key Press Event:
    If (ESC Key) AND (QGraphicsItem Mouse Grab Active)
      START Abort Drag-Move Mode, and
      Restore Selected Obj Pre-Move Icon Positions, and save to model.
  
  ItemChange [ItemPositionChange] Event Filter:
    If (Abort Drag-Move Mode)
      Replace Mouse Move Postion with the Saved Pre-Move Position

-------------------
RwGraphicsScene.cpp
RwGraphicsScene.hpp
-------------------

Abort Drag-Move Mode support:

 private:
   bool _abortDragMoveMode;

 public:
   void abortDragMoveMode_START()    { _abortDragMoveMode = true; }
   void abortDragMoveMode_STOP()     { _abortDragMoveMode = false; }
   bool abortDragMoveMode_ON() const { return (_abortDragMoveMode); }

---------------------
WorkspaceGfxScene.cpp
WorkspaceGfxScene.hpp
---------------------

When needing to save the Pre-Move positions of SimObj GraphicsItems,
do so for ALL SimObj GraphicsItems items on the workspace  -- not just 
the selected ones.  This isn't necessary, but it is safer.

  OLD: void recordSelSimObjItemPreMovePositions();
  NEW: void recordSimObjItemPreMovePositions();

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