In this commit, we update the Rescan call in the interface to map the
outpoint to the address that the outpoint holds. We do this as BIP 158
has recently been updated to match on the prev output script rather than
the outpoint itself. Additionally, in the near future, btcd (then
bitcoind), will switch over to using the BIP 158 filters internally,
which will also match on the output scripts.
This commit allows neutrino to simulate the GetBlockHeader RPC, and
allows chain client code to use the call with both btcd/RPC back end
and the neutrino back end.
