Add abitrary persistence to Wallet
#757
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Types like "Txid", "BlockHash", "DescriptorId" are all just 32 byte arrays that represent hashes with different meanings. Currently they are represented as strings at the FFI layer, but they are also meaningful arrays of bytes. Particularly if a user wants to implement persistence over the FFI layer, they would want to efficiently serialize these types. Here I am introducing a new group of types that all implement display, allow serialization to bytes, and may be constructed from an array of bytes. I went with a "rule of 3s" here, and also introduced a macro to do these implementations because there was a lot of boilerplate involved. Note that all of these are included in the wallet changeset, which is required to represent in-full for FFI-layer custom persistence.
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cargo fmtandcargo clippybefore committingNew Features:
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