Obfuscated authorization names

[cdata]

Currently the user-given names of authorizations in a sphere are public, human-readable strings. This represents an obvious privacy leak, as most users probably don't expect the names of the full list of devices and/or other clients they have authorized to be visible to everyone else on the network.

We should revise authorization naming so that the names are hidden/obscured/obfuscated/encrypted from the perspective of third parties.