Take list or 1d array of numbers and automatically map these to colors based on the cmap argument. Useful for line collection for ROIs and line stacks, but also for single Line such as y_colorbar

• modify cmaps for line and scatter (position based graphics) after creating them, probably implement in CmapFeature

• modify cmap for colletions

• Use an array of values for mapping the colors, for examples if we have a cosine wave allow passing in a 1D array of values that represent a variable for mapping from a colormap, for example set the cmap based on sine values for a cosine line. Or with caiman set the contour colors based on r_values

• there needs to be a way to modify these values after being set, maybe in the CmapFeature for Line and Scatter

• modify the cmap_values after being set for collections