Certificate UI/Import (#798)

* Sketching out.

* WIP

* WIP

* Dump

* Apply stash

* Merge + WIP

* UI

* More WIP

* Agent config

* UI cleanup

* Restore dirty files

* XPC

* Edit/delete

* UI fixes

* Cleanup

* Change id for OpenSSHCertificate to hex of md5

* Fix runtime warning for confirmation dialog

* Mark strings as reviewed

* Cleanup

* Fix agent tests

Sources/SecretAgent/XPCInputParser.swift

@@ -1,5 +1,6 @@
 import Foundation
-import SecretAgentKit
+import OSLog
+import SSHProtocolKit
 import Brief
 import XPCWrappers
 import OSLog