[Spec Change] Use public key (hashed?) as id

[Aras14HD]

This would eliminate attacks based on impersonating nodes, but potentially increase the message length and need a few more features like a key type byte attached to the ID, moving to new IDs, certificates signed via the old ID referring to the new ID and potentially more.

[Aras14HD]

Potential solution for moving to new IDs:

Set the distance to the old ID(s) to 0, and respond with a "moved" message containing the new ID signed by the old one on its behalf.
Upon receiving such a response, the node sending the message/request verifies the signature and changes the ID/Public Key of the contact internally.