Fix exporting regions' RGB colors #675
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Region export has generated colormaps for the number of labels in the image, but displayed images use a discrete colormap generated for a these labels plus a duplicated set of corresponding negative value labels. The colormap randomization requires this exact number of labels to generate an identical set of colors, meaning that the exported labels have had a different set of colors. Fix by using the same colormap generation wrapper function as used in the setup for labels image display.
Change data type from unsigned to signed int to fix `OverflowError` when adding in negative int labels to a sequence of `uint` labels.
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Region names can be exported along with their RGB colors, but these values were incorrect for region IDs that included corresponding positive and negative values. The RGB values are fixed here, along with support for generating this export in NumPy v2.