LP1846042 Angular grid filters display streamlining

LP1846042 Angular grid filters display streamlining

Moves all grid filter inputs and actions into a dropdown menu accessed
by clicking on the 'Filter' text-and-icon along the top of each grid
column (when filters are enabled).  Moving the actions into the
drop-down means the filter inputs, etc. are only visible when accessed
and have minimal impact on the primary grid display.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Tiffany Little <tlittle@georgialibraries.org>