Reorg dirs: move widgets from GUI/Views/IntensityDataWidgets to new directory GUI/Views/ProjectionWidgets
The sourcecode
IntensityDataProjectionsWidget.*ProjectionsEditor.*ProjectionsEditorActions.*ProjectionsEditorCanvas.*-
ProjectionsPlot.*and ProjectionsPropertyPanel.*ProjectionsToolBar.*-
ProjectionsWidgets.*and SaveProjectionsAssistant.*
has been moved from GUI/Views/IntensityDataWidgets/ to the new directory GUI/Views/ProjectionsWidgets/ because it is a separate component. By doing so the dependencies get clearer because the projections editor is based on functionality of the mask editor (in MaskWidgets) which itself is based on functionality found in IntensityDataWidgets.