Add preliminary did:web, improve did:key and some other structures

This is an update release that adds some foundational structures and methods. Not ready for production.

Preliminary did:key, infrastructure for hardware rooted key management

v0.0.1

Tries to fix NuGet push to NuGet.org (#228)

Version naming improvements

v0.0.0.6-alpha

Fix versioning (#221)

Preliminary did:key, infrastructure for hardware rooted key management

v0.0.0.5-alpha

Fix NuGet push hardening (#220)

Update NuGet files

Update NuGet files with icons.

Test of release pipeline

This is a NuGet pipeline test release.