LP1889113 Angular org select persistKey support

LP1889113 Angular org select persistKey support

* Support reading and writing org-select values using server settings.
* Adds a new @Input fallbackOrg[Id] which is used in cases where no
  persisted value is found.
* Adds a new @Otput called componentLoaded which fires once when the
  selector has completed all of it's load time work.
* Improvid code documentation.

Signed-off-by: Bill Erickson <berickxx@gmail.com>
Signed-off-by: Terran McCanna <tmccanna@georgialibraries.org>
Signed-off-by: Jane Sandberg <sandbej@linnbenton.edu>