Add lnd support

[C-Otto]

Is your feature request related to a problem? Please describe.
As a user who also runs a lnd node, entering the corresponding transaction/address details is very time consuming. I'd like BitBook to help me as much as possible.

Describe the solution you'd like
I'd like to let BitBook work with lnd so that I don't have to copy-paste a lot of data. Direct RPC support would be nice, but I'd be happy creating a few files based on lncli output (e.g. lncli wallet listsweeps > sweeps.json) and parse these from within BitBook (e.g. read-lnd-sweeps-file /tmp/sweeps.json).

Describe alternatives you've considered
Copy-pasting all data manually. The wizard (#27) might make that less frustrating, but it's still a lot of unnecessary work.

• lncli wallet listsweeps ✔️ add support for lnd sweep transactions #48
• lncli closedchannels ✅ add basic information for closed channels #54 lnd: parse sweep transactions for HTLC resolutions #55 (missing: mark outputs as foreign)
• lncli listchannels ✔️ add information obtained by lncli listchannels #57
• lncli listchaintxns:
  • pool deposits (non-lnd inputs and outputs are pool addresses, make use of label and amount) ✔️ add information for pool account deposit transactions #71
  • pool account creation ✔️ add information for pool account creation transactions #61
  • pool close account ✔️ add information for pool account close transactions #67
  • deposits into lnd wallet: amount positive, fee 0, output with unknown ownership, amount matches ✔️ add information from onchain transactions that send funds to lnd #58
  • open channel: no label, negative amount, one of the outputs is channel, transaction is channel open transaction, channel capacity is amount minus fees: mark all addresses as owned ✔️ lnd: read channel open details from onchain transactions #59
    • set description to "local" (should be "unknown") ✔️ set initiator in description to local #88
  • update documentation (descriptions will be overwritten, labels must not be set for lnd transactions?, descriptions must match pattern)
  • sweeps from old HTLCs: amount 0 (?), 1to1, no label (related: add information from sweep transactions only listed in listchaintxns #70)
  • spending from the lnd wallet ✔️ add information for change addresses for spend transactions #72
• lncli listunspent ✔️ parse unspent outputs from lnd #50
• pool auction leases ✔️ add information for pool leases #73

[C-Otto]

Optimization idea: mark channel address as owned if all inputs are owned
EDIT: Wasn't necessary in my case, possibly because I already have information for the inputs (by following the coins / other outputs).

[C-Otto]

What about labels which are set by the user?

[C-Otto]

Also mark channels as owned if they were opened by the remote peer? Most likely, there are owned funds in the channel, which we would like to track. ❌ No: otherwise, we'd need to track the foreign coins that funded the channel. We're only interested in the coins that were sent to us (when the channel closed), and we cannot track those (they result out of off-chain transactions).

[C-Otto]

Gather more information about channel close outputs (especially HTLCs) by inspecting the scripts. See https://github.com/alexbosworth/bolt03.
#89

[C-Otto]

Cooperative closes: mark the other output as foreign (if not marked as owned), it belongs to the remote node ✔️ #74