use bounds formatoption widget for colors dialog
This commit revises the color settings dialog and uses the bounds formatoption dialog. We additionally added a live-updating preview of the resulting colorbar
@tobstac: It would be nice of you could have a look at it on mybinder and give me some feedback
This PR integrates with https://github.com/psyplot/psy-simple/pull/14
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implemented better selection of colormaps -
Tests added (for all bug fixes or enhancements) -
Tests passed (for all non-documentation changes) -
revert 8ffe4c9e
Closes #7 (closed)