Renamed attributes.EllipseEndAngle.gif to attributes.EllipseEndAngle.png
Renamed Arrow_Right.gif to Arrow_Right.png
Renamed Arrow_Others.gif to Arrow_Others.png
Renamed Arrow_None.gif to Arrow_None.png
Renamed Arrow_Left_Right.gif to Arrow_Left_Right.png
Renamed Arrow_Left.gif to Arrow_Left.png
Renamed ArrowUp.gif to ArrowUp.png
Renamed ArrowDown.gif to ArrowDown.png
Renamed action.ui.Undo.gif to action.ui.Undo.png
Renamed action.ui.ToggleToolkitPanel.gif to action.ui.ToggleToolkitPanel.png
