Now that the new `btcutil/v1.0.0` tag has been pushed, we update the new
internal modules to point to the top-level `btcd` repo via replace
directives.
In this commit, we update all the btcutil imports to point to the new
sub-module.
In the same commit, we also modify the recently added `btcutil/go.mod`
file as we need to continue pointing to the _old_ version of btcd, until
we merge this PR and push a new tag.
Goleveldb recently had a PR in where memory allocation was reduced
drastically (github.com/syndtr/goleveldb/pull/367). Update goleveldb
to use that PR.
In this commit, we update to the latest version of btcutil which
contains a bug fix for filter matching, and as optimizations speed up
both filter matching and constructions.
In this commit, we update to the latest version of `btcutil`. This version
contains a bug fix for the neutrino filter generation. The implementation
within `btcutil` didn't fully comply with the BIP specification as it
included some OP_RETURN outputs, rather than excluding them all. As a
result, any active `btcd` node on mainnet/testnet will need to _drop their
entire `cfindex`_ and re-index after this is merged in.
