ENH: change imageoperations.swt3 - After decomposition, set `data` to `LLL.copy()`, this ensures that over next iterations,    the previous LLL decomposition is used as input - Move assignment of `approximation` outside iteration    This only has to be done once, using the last LLL decomposition. This is equal to `data` - Convert approximation to sitkImage, which is the format needed as input for the feature calculation classes
ENH: change imageoperations.swt3
- After decomposition, set `data` to `LLL.copy()`, this ensures that over next iterations,
   the previous LLL decomposition is used as input
- Move assignment of `approximation` outside iteration
   This only has to be done once, using the last LLL decomposition. This is equal to `data`
- Convert approximation to sitkImage, which is the format needed as input for the feature calculation classes

Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics,Radiomics/pyradiomics