Add parameter file support

[JoostJM]

Update the user interface (SlicerRadiomicsWidget) to optionally extract features using a PyRadiomics Parameter File.

• Group the 3 different types of customization (Feature Class, filter and settings) together into 1 groupbox
• Add radiobuttons to toggle between manual customization (using UI elements) and parameter file customization (using a parameter file)
• On toggle, hide to non-selected group box
• When in parameter file customization mode, disable the Apply button so long as the paramter file path element does not contain an existing file
• Split the setup function into separate functions per section to improve readability

Update the logic (SlicerRadiomicsLogic) to support the parameter file

• Add a second run function: runWithParameterFile
• Instantiate the extractor in the respective run functions
• Decode the labelNode and Segementation node in the calculateFeatures Function

Add a test running SlicerRadiomicsLogic with an example parameters file