[WIP] btcutil: Add library functions for BIP-0352 silent payment _scan_ support #2466
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This commit adds library functions for calculating block tweaks. A block tweak is the set of Silent Payment transaction tweaks that are contained in a block. A SP transaction tweak is the pre-calculated input public key sum tweaked by the input hash of a transaction and is required for light clients to be able to calculate potential Silent Payment outputs in a transaction or block without needing to download the full block/transaction.
This commit adds helper functions that can be used by clients (including light clients) to scan the chain for potential Silent Payment outputs.
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Depends on #2244, only the last two commits are new.
This is still very much work in progress.