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This adds functions for reading the undo data from disk with a retrieved block tree entry. The undo data of a block contains all the spent script pubkeys of all the transactions in a block. For ease of understanding the undo data is renamed to spent outputs with seperate data structures exposed for a block's and a transaction's spent outputs. In normal operations undo data is used during re-orgs. This data might also be useful for building external indexes, or to scan for silent payment transactions. Internally the block undo data contains a vector of transaction undo data which contains a vector of the coins consumed. The coins are all int the order of the transaction inputs of the consuming transactions. Each coin can be used to retrieve a transaction output and in turn a script pubkey and amount. This translates to the three-level hierarchy the api provides: Block spent outputs contain transaction spent outputs, which contain individual coins. Each coin includes the associated output, the height of the block is contained in, and whether it is from a coinbase transaction.