Merge branch 'refactor_model' into 'develop'

.gitignore

GUI/Models/Data1DViewItem.cpp

GUI/Models/DataItemUtils.cpp

GUI/Models/FitParameterHelper.cpp

GUI/Models/InstrumentItems.h

GUI/Models/ItemCatalog.cpp

GUI/Models/JobItem.cpp

GUI/Models/JobItem.h

GUI/Models/JobModel.cpp

GUI/Models/JobModelFunctions.cpp

GUI/Models/JobQueueData.cpp

GUI/Models/ModelPath.cpp

GUI/Models/ParameterTreeItems.cpp

GUI/Models/ParameterTreeUtils.cpp

GUI/Views/FitWidgets/FitComparisonWidget.cpp

GUI/Views/FitWidgets/FitComparisonWidget1D.cpp

GUI/Views/FitWidgets/FitObjectiveBuilder.cpp

GUI/Views/FitWidgets/RunFitControlWidget.cpp

GUI/Views/JobWidgets/JobPropertiesWidget.cpp

GUI/Views/JobWidgets/JobResultsPresenter.cpp