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Qt Coin Viewer
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it's a dynamic load library
main goal: visualize 3D object from ROOT TPad canvas

it consist of tree classes:
 -- TQtRootCoinViewer3D
    inherited from TVirtualViewer3D (root abstract class, it's allow root to dynamic load this lib)
    this class creates a real viewer (instance of TQtCoinViewerImp) (constructor),
    create a tree of TObject3DView classes from proper fabric (BeginScene),
    and fill viewer (EndScene)
 -- TQtCoinViewerImp
    this class inhered from QMainWindow qt class, so it's a window
    and have one more father: TGLViewerImp, to provide common interface and signal-slot achieve
    this class creates an instance of SoQtExaminerViewer class and embedded it as central window widget
    this class implement a select/deselect mechanism
 -- TObjectCoinViewFactory
    inhered from TObject3DViewFactory like TObjectOpenGLViewFactory and create a coin specified scene graph