LP#1730752 Webstaff grid column batch config dialog

LP#1730752 Webstaff grid column batch config dialog

Adds a new "Manage Columns" grid action which opens a batch grid column
configuration dialog.  In the dialog, users can show/hide multiple
columns at once.  The column position actions
(left/right/far-left/far-right) and sort priority settings have also
been moved to this new UI.

The existing 'Configure Columns' action has been renamed to 'Managed
Column Widths' and now only supports making columns wider and narrower.

Signed-off-by: Bill Erickson <berickxx@gmail.com>