Enhance tools like "Field Summary" tool to allows multiple selections

[fharper]

The "Field Summary" tool and several others have a configuration requirement that provides a list of fields to select or deselect.  The selection action is singular meaning you can only effect the action on one item in the list of many.  As the number of fields we work with grows significantly this becomes a time consuming and tedious task.

This should be enhanced to allow highlighting of multiple fields to select or deselect as we can do in tools like the "Select" tool.