LP1852782 MARC editor prevent navigation with changes

LP1852782 MARC editor prevent navigation with changes

Show a confirmation dialog when the user attempts to navigate away from
the MARC edit tab in the catalog if the MARC editor has pending changes.

The dialog will be shown if the user attempts to change tabs or navigate
away from the record detail page w/in Angular.

If the user unloads / reloads the page, the stock browser onbeforeunload
confirmation dialog will be displayed instead.

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