LP1840287 Floating group admin minor code tweaks

LP1840287 Floating group admin minor code tweaks

* Added grid sorting to both group and group member grids.

* Avoid using the defaultNewRecord in fm-editor directly, by cloning it
  as needed, so that subsequent new records (within a single parent
  component instance) do not pick up values from the previously created
  record.

* Renamed the eg-admin-page @Input() 'hideFields' to 'hideGridFields'
  to better explain how the value will be passed along.

* Replace access of fieldmapper innards (thing.a[0]) with field names
  (thing.id())

* Remove unused <eg-string /> entries.

* Avoid unnecessary newlines in translatable strings.

* Remove unused @Inputs() and unnecessary functions

* Remove unneccessary TreeModule import

* Removed a redundant <eg-title /> -- <eg-staff-banner /> will set the
  title when present.

* Various 'ng lint' repairs.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>