v0.3.3

• Use Nip-04 as a default for Nostr communication
• Add incoming bill validation
• Add block data validation
• Add bill action validation for incoming blocks
• Add signer verification for incoming blocks
• Add recourse reason to RequestRecourse block data
  • (breaks existing persisted bills, if they had a request recourse block)
• Move bill validation logic to bcr-ebill-core

Version: v0.3.3