Menu action to export a watchonly wallet #872
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CanSelfExpand() reports whether a descriptor can be expanded without needing any caches or private keys to be provided by the caller of Expand().
If a descriptor does not need any caches or private keys in order to expand, then CanGetAddresses() should return true for that descriptor.
If a new WalletDescriptor is provided to us with a cache, write the cache to disk as well.
When listdescriptors retrieves the descriptors from the wallet, instead of having this logic in the RPC, move it into CWallet itself. This will enable other functions to get the descriptors in an exportable form.
ExportWatchOnly produces a watchonly wallet file from a CWallet. This can be restored onto another instance of Bitcoin Core to allow that instance to watch the same descriptors, and also have all of the same initial address book and transactions.
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Allows a user to export a watchonly version of their wallet to be used in an airgapped setup.
Built on bitcoin/bitcoin#32489