Support for 1.3.6.1.4.1.44363.44 - Delegated Credentials

[jcjones]

OID 1.3.6.1.4.1.44363.44 is a draft ietf standard (draft-ietf-tls-subcerts/) which would be nice to simply decode to DelegationUsage or perhaps something like Credential Delegation authorized for compatible web servers.

https://dc.crypto.mozilla.org/ leads to a site with this in its cert.

[jcjones]

Moved to https://bugzilla.mozilla.org/show_bug.cgi?id=1615069