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Add get_extended_pubkey_display() to HWI trait#107

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pythcoiner wants to merge 2 commits intowizardsardine:masterfrom
pythcoiner:xpub_display
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Add get_extended_pubkey_display() to HWI trait#107
pythcoiner wants to merge 2 commits intowizardsardine:masterfrom
pythcoiner:xpub_display

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@pythcoiner
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This PR add a method to HWI trait for fetch an Xpub w/ a "non-standard" derivation path, this is needed for Ledger & BitBox devices in order to fetch an Xpub w/ m/48'/0'/1'/2' for instance.

When this method is called the user will be prompt to ACK before generating the Xpub whereas calling get_extended_pubkey() will blindly generate the Xpub or fail if "non-standard"

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tested on wizardsardine/liana@4c08ab5 w/ Ledger Nano S & BitBox02

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