module indexer introduces a extensible architecture for indexing the
chain. It provides a base class which handles syncing with the chain,
handling re-orgs, interruptions, dynamic toggling, etc. TXIndexer
and AddrIndexer are provided for indexing transactions and addresses,
using the same flags as before i.e --index-tx and --index-address.
Indexes are stored in a different database and can be maintained
independently of the chain.
updates validateaddress to match the changes
in bitcoind https://github.com/bitcoin/bitcoin/pull/10583.
removes the fields ismine and iswatchonly, those
are things that a wallet would know, not a node.
adds segwit related fields, witness_version and
witness_program. test changes to the node rpc method
validateaddress with p2pkh, p2sh, p2wpkh and p2wsh addresses
