Auch den privaten Key ein `x5c` (X.509 key chain) Attribut geben - planning#361

See merge request !6

feat: examples to verify metadata (planning#239)

See merge request !7

The code would've been a little easier with external dependencies
but the way it's implemented now (0 external dependencies) is easier
to integrate in application code.

PKCS12 / JWK Tool

See merge request !5

This reverts commit b8c57834.

Callback validation script

See merge request !3

Derive JWKs from self-signed certificate

See merge request !2

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