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ENH: Read/write color properties of components and seg transform

Shreeraj Jadhav requested to merge shreeraj.jadhav/slicersmtk:ENH-retain-colors into master

Read/write color property between MRML nodes and respective SMTK components.

Copy origin, spacing, and orientation matrix of MRML segmentation nodes to SMTK image. This was not done previously, causing spatial mismatch of segmentation image with extracted geometries.

Read/Write colors, names, and orientation of segmentations correctly. Each segmentation will be saved as a vtkImageData labelmap, which implies that segments are mutually exclusive. Overlapping segments will overwrite each other. To preserve overlapping segments, user must create separate segmentation nodes in Slicer.

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