Migrate all btcd dependencies to the new per-package v2 modules (wire/v2,
txscript/v2, chaincfg/v2, chainhash/v2, btcutil/v2, psbt/v2, btcec/v2)
introduced by btcd v0.26.0, and pin the tagged ecosystem versions:
btcwallet v0.17.0, neutrino v0.18.0 and lightning-onion v1.4.0.
The bulk of the import rewrite was produced by the scripted diff from
https://github.com/btcsuite/btcd/pull/2547 (followed by 'make rpc'). The
address symbols that moved out of btcutil into the new address package
are imported as btcaddr where a local "address" variable would otherwise
shadow them. The go.mod/go.sum updates and the remaining manual
compilation fixes are folded into this single commit so it builds on its
own (the migration was previously split into a reproducible scripted-diff
plus follow-ups, intended to be squashed on merge).
In this commit, we switch to using the new txscript.ScriptTemplate
function. This allows us to write the script in plain text, using some
hidden template operations to swap in items like keys or sigs.
This reduces in less code and boiler plate over all, the code that
defines the script now reads as if it was a comment.
In this commit, we update all the taproot scripts to also accept an
optional aux leaf. This aux leaf can be used to add more redemption
paths for advanced channels, or just as an extra commitment space.
Because the original dcrec secp256k1 library that is used for the
Schnorr signature primitives uses different hash algorithms than the
btcd secp256k1 library. Therefore pulling in the wrong library can lead
to weird and unexpected errors. We try to make it harder to make the
mistake by not using the library directly in lnd in the first place.
Note that it is still indirectly needed by the btcd secp256k1 library,
therefore the module dependency is still expected to be there, just
moved to the indirect section.
The inclusion proof field in the TapscriptPartialReveal function was
incorrect. An inclusion proof can be zero or more elements of 32-byte
slices. So an empty inclusion proof can be valid too for a tree that
only consists of a single leaf.
