Tracking: full LN interoperability

[dr-orlovsky]

Tested against c-Lightning 0.9.x

1. Connectivity:
   • BOLT-8: Brontide encryption protocol & connectivity
   • BOLT-1: lightning serialization of data types
   • BOLT-1: TLV type serialization
   • BOLT-1: peer protocol (init, ping & pong exchange)
   • BOLT-9: channel feature flags
2. Channel establishment
   • BOLT-3: Key derivation
   • BOLT-3: Proper tx structure generation
   • BOLT-2: Outbound channel opening
   • (partial) BOLT-2: Inbound channel acceptance
   • BOLT-2: Channel re-establishment
3. HTLC payments
   • BOLT-3 HTLC outputs and transactions
   • BOLT-7: Onion encoding
   • (partial) BOLT-7: Gossip protocol
   • (partial) BOLT-7: Route computing
   • BOLT-2: HTLC P2P messaging
   • (partial) BOLT-2: Commitment transaction updates
   • (partial) BOLT-11: invoicing
4. Channel closing
   • BOLT-2: Cooperative closing
   • Uncooperative closing
   • Penalty execution