More Extension Permissions

Improved the diversity in the permissions extensions maybe assign. The call barge, teaching, and listening Intercom are still present from version 3, with DND override for secretary-boss relationships, the ability to define who is allowed to change night-mode’s destinations, the permission to clean up an Extensions which is primarily used by hotel receptionists and now the ability to explicitly list who is allowed to call an extension (large deployments with management circle)