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Fix wallet sync not finding coins of addresses which are not cached
Previously, electrum-based blockchain implementations only synced for `scriptPubKey`s that are already cached in `Database`. This PR introduces a feedback mechanism, that uses `stop_gap` and the difference between "current index" and "last active index" to determine whether we need to cache more `scriptPubKeys`. The `WalletSync::wallet_setup` trait now may return an `Error::MissingCachedScripts` error which contains the number of extra `scriptPubKey`s to cache, in order to satisfy `stop_gap` for the next call. `Wallet::sync` now calls `WalletSync` in a loop, cacheing inbetween subsequent calls (if needed).
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