Add intensity scaling parameter.

[alexzwanenburg]

Some radiomics packages, such as pyradiomics, offer the possibility to scale image intensities using a scalar value. To allow validation of results obtained from such packages, MIRP should offer an intensity scaling parameter that can be configured by the user.

• [x] Add a new intensity_scaling parameter to ImagePostProcessingClass in mirp/settings/settingsImageProcessing.py, with default value of 1.0.
• [x] Implement intensity scaling in standard_image_processing in mirp/workflows/standardWorkflow.py. Intensity scaling should take place after any normalisation procedure.
• [x] Ensure that intensity scaling (other than 1.0) updates the class of internal image objects, similar to intensity normalisation.

[alexzwanenburg]

@MaEmily @LukasDuenger

[alexzwanenburg]

Implemented on 2.2.0 branch.