btcsuite / btcutil / 533

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hdkeychain: add CloneWithVersion to set custom HD version bytes

This adds a new method to the ExtendedKey type that allows cloning the
extended key with custom HD version bytes. It does not mutate the
original extended key on which the method is called.

Added some tests to demonstrate the utility of this method, i.e.,
conversion between standard and SLIP-0132 extended keys.

9 of 9 new or added lines in 1 file covered. (100.0%)

3317 of 3893 relevant lines covered (85.2%)

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