Reorg dirs: disentangle widgets in `GUI/Views`

t.knopffrequested to merge
reorg_dirs2 into develop

To disentangle some dependencies in the GUI/Views directories, the following has been made:

  • GUI/Views/FitWidgets/plot_constants.h has been moved to GUI/Views/IntensityDataWidgets/. This way FitWidgets is dependent on IntensityDataWidgets but not vice versa anymore.
  • GUI/Views/SampleDesigner/DesignerHelper.* has been moved to GUI/Views/CommonWidgets. This way GUI/Views/InfoWidgets is not dependent anymore on GUI/Views/SampleDesigner.

Furthermore GUI/Views/StyleUtils.* has been moved to GUI/Views/CommonWidgets/ because general GUI-related code is located there.

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