* src/engine/api/geary-engine.vala (Engine): Require a ServiceInformation
object for IMAP and SMTP when creating orphan info objects. Update call
sites.
* src/client/accounts/account-manager.vala (AccountManager): provide
factory methods for constructing local service info objects. Use these
when re-constituting accounts. Use a singleton SecretMediator object
instance as a bonus.
* src/client/accounts/add-edit-page.vala (AddEditPage): Get
ServiceInformation objects from the account manager, pass an instance
of GearyApplication through so it has access to the manager. Update
call chains back to GearyController to pass the app instance through.
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