Add soft deletes to all services

[rtisma]

Currently, delete operations on any BaseService permanently deletes the record from the database. Instead, entities should soft-delete entities, in the event they need to bring them back. This includes:

• Application
• Group
• User
• Policy
• User/Group permissions

Other things to think about:

• cascading a soft delete
• how do you undelete?
  • the undelete should also be cascaded
• how do you search deleted entities?