Add Colormap option to LabelMapToRGB filter.
Add Colormap option to LabelMapToRGB filter.

This requires the following commit from ITK:

commit 6be7e307e1ec43db4b1964a32ae819100e45631d
Author: Bradley Lowekamp <blowekamp@mail.nih.gov>
Date:   Fri Oct 14 15:28:33 2016 -0400

    ENH: Add Functor Accessors to LabelMapToRGB filter

    This enables customization of the label to color lookup
    table. This
    change makes the interface consistent with that of the following
    filters: LabelToRGBImageFilter, LabelOverlayImageFilter,
    LabelMapOverlayImageFilter and LabelMapContourOverlayImageFilter.

Change-Id: Idfb6f40c2ff1de02c945b1ba70aa0d0e25a748d3

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