Nyno version 6 release: Searchable JSON, Signing and pki-encryption

Searchable JSON is here
- No more manually searching big same-colored JSON.

Special Public Key Infrastructure (nyno-pki-)

- Generate secure signing keys where the
Base32 Ed25519 public key always starts with "USER" (for human users) or "FLOW" (for automated actors).
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- This is for decentralized identities and spam mitigation (PoW), like
for self-hosted community use cases.
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- Note: this might take a few minutes to generate. It's recommended to save the
keypair to a file using nyno-file-write.
- Also includes encryption/decryption using a dedicated
for_e2e keypair + methods.
Migration from 5.x to 6.
- For security
nyno-if nodes must now always use 3 arguments (left, compare statement, right) instead of defining everything in one argument (args[0]).