Add 'Select all' and 'Select none' buttons to checkboxes #834
Description
When presented with a Fieldmanager_Checkboxes like the one in the screenshot below, it would be handy to be able to select all or none of the boxes at once:
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When presented with a Fieldmanager_Checkboxes like the one in the screenshot below, it would be handy to be able to select all or none of the boxes at once: