remove net oriented sample editor's UI widgets (toolbox, property editor etc.)

GUI/View/SampleDesigner/SamplePropertyWidget.cpp

GUI/View/SampleDesigner/SamplePropertyWidget.h

GUI/View/SampleDesigner/SampleToolBar.cpp

GUI/View/SampleDesigner/SampleToolBar.h

GUI/View/SampleDesigner/SampleToolBox.cpp

GUI/View/SampleDesigner/SampleToolBox.h

GUI/View/SampleDesigner/SampleToolBoxGroupView.cpp

GUI/View/SampleDesigner/SampleToolBoxGroupView.h

GUI/View/SampleDesigner/SampleToolBoxTreeWidget.cpp

GUI/View/SampleDesigner/SampleToolBoxTreeWidget.h

GUI/View/SampleDesigner/SampleTreeWidget.cpp

GUI/View/SampleDesigner/SampleTreeWidget.h