silx.gui.plot: Added getValueData method to PlotWidget image items
#3378
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This PR adds a
getValueDatamethod to all image items.This method returns a 2D array of float (or int). It allows to simplify code requiring 2D data by avoiding handling RGBA to intensity conversion at multiple places.
It also paves the way to mask associated to an image, since it allows to return the masked array (with NaNs where masked) rather than having to do this at multiple places.
This PR is extracted from PR #3369 in order to split the changes in smaller chunks.