0.1 Beta 4

Breaking changes:

• Updated upstream crates (bitcoin, bitcoin_hashes, secp256k1, grin_secp256k1zpk, miniscript, lightning) with many PRs merged
• EmbedCommitVerify now can mutate container data (used for returning tweaking factors)
• Upgrading rand version to the most recent one (blocked previously by grin_secp256k1zpk dependency)
• Changied txout seals to use u32 vouts instead of u16
• Changed txout blinding factor to be u64 instead of u32

Other changes:

• Test coverage >50% (zero-knowledge functionality & RGB contracts structures)
• Returning tweaking factors
• Minimal support for Tor V2 addresses; improved internet address parsing