Add wallet-backed chainntnfs implementations #92
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This was referenced Mar 30, 2020
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This introduces the dcrwnotify and remotedcrwnotify drivers, usable by embedded and remote dcrwallets respectively. The intention for these drivers is for them to replace the existing dcrd driver so that dcrlnd can rely exclusively on the wallet for its on-chain operations. This is work towards eventually supporting SPV mode wallets so that dcrlnd can also function in an SPV mode. This commit only introduces the new chain notification drivers but does not yet modify the app to use them. Both drivers are implemented by way of a unified chainscan notification driver.
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Rebased on top of #83
Part of #80
This adds implementations for the chainntnfs package that use the wallet as source of chain events.
This allows to further decouple dcrlnd from an underlying dcrd, which is a requirement for having a dcrlnd instance running in SPV mode.