Last (hopefully) breaking changes ahead of beta

[cdata]

This change implements the remaining breaking changes to the Noosphere core data structures that we hope to land ahead of the upcoming Private Beta phase of Subconscious. The breaking changes are several, and I'll attempt to document them here:

Renames

The following core domain concepts have been renamed to be more coherent or consistent with the way we have come to talk about them among ourselves:

• Links -> Content
• Names -> AddressBook / Identities
• Authorization -> Authority
• Allowed UCANs -> Delegations
• Revoked UCANs -> Revocations

HAMT layout

The HAMT layout changes implemented in #284 have been almost entirely reverted. With the landing of the typed CID in #297 , we can now leverage the type system to be precise about what means when the key or the value of the HAMT is a CID. This revised approach does lead us to have to be more fiddle-y when crawling the sphere to stream its blocks, but otherwise it gives us improved data layout flexibility while maintaining the benefits of the change made in #284 .

Other breaking changes

The following additional breaking changes were made:

• More method names that were prefixed with try_ have had that prefix removed to align with our convention elsewhere
• Versions of the fastcdc and base64 crates were updated by breaking increments

[jsantell]

Fantastic improvements and clarifications here @cdata!