Use Varint serialization #299
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Change batchproof serialization to use varints, saving space for disk and bandwidth for network.
UndoBlocks need to be saved and re-accessed whenever there is a reorg with the Bitcoin blockchain. Serialization and Deserialization is added so that these blocks can be saved and fetched from disk. UndoBlocks are also now exported so that callers will be able to access the new Serialize() and Deserialize() methods.
utcd has many optimizations that btcd doesn't have. Switching to utcd speeds things up drastically for the binaries in cmd/. We won't be pointing to the branch utreexo in utcd as breaking changes to the accumulator package will result in utcd failing to build. This makes changes annoying to deal with.
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Things done:
accumulator: Use varints for serializationimports thewirepackage and uses the varint serialization functions for batchproof.accumulator/undo: Add serialization for undoblocksadds undoblock serialization/deserialization (uses varint) and exportsUndoBlockto expose the serialization functions.go.mod, go.sum: Switch to the btcd++ branch in utcdnow imports utcd instead of btcd. However, it only imports the btcd++ branch as that branch doesn't have any utreexo specific packages, therefore not creating any dependency cycles.This PR doesn't produce backwards compatible proofs as the serialization is different.