Ensure codec values are registered in the spec.

[davidlehn]

This value is used here but not registered in the spec:

_addRegistration(0x32, 'https://purl.imsglobal.org/spec/ob/v3p0/context.json');

If the id is stable enough to last forever, it should be registered in the spec. If not, then this lib and the spec needs a new feature to support use of unregistered ids.

[davidlehn]

This context may already be obsolete. See: https://github.com/digitalbazaar/cbor-ld-spec/issues/15

[BigBlueHat]

This implementation is being used to inform a new updated CBOR-LD spec at https://github.com/json-ld/cbor-ld-spec/

Consequently, we'll need to make some decisions on how we handle OpenBadges context file proliferation.

[dlongley]

I think this issue has become stale because the spec no longer functions in a way that this is actionable. Instead, anyone can add a registry entry for maximizing compression that includes whichever contexts (and other values) are of interest for their use case.