Revert "ctd, plus some complex fwd decl"

GUI/View/Plot2D/ColorMapCanvas.h

GUI/View/Plot2D/IntensityDataCanvas.h

GUI/View/Plot2D/IntensityDataWidget.cpp

GUI/View/Plot2D/IntensityDataWidget.h

GUI/View/SampleDesigner/CompoundForm.cpp

GUI/View/SampleDesigner/CompoundForm.h

GUI/View/SampleDesigner/CoreAndShellForm.h

GUI/View/SampleDesigner/LayerForm.cpp

GUI/View/SampleDesigner/LayerForm.h

GUI/View/SampleDesigner/MaterialInplaceForm.h

GUI/View/SampleDesigner/ParticleForm.h

GUI/View/SampleDesigner/ParticleLayoutForm.cpp

GUI/View/SampleDesigner/ParticleLayoutForm.h

GUI/View/SampleDesigner/SampleForm.cpp

GUI/View/SampleDesigner/SampleForm.h