wire: add msgutreexoproof and msggetutreexoproof #232
Merged
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Instead of a msgutreexoblock, we prefer having a separate msgblock and a
msgutreexoproof. This separates out the utreexo data from the msgblock
which allows having a utreexo bridge node which can opt to not save the
blocks.
MsgGetUtreexoProof allows nodes to request for specific data in a
utreexo proof. This lets nodes to omit requesting for hashes that it's
caching and thus allows for bandwidth savings.