Add an option to change the UHJ decoder method

For 2-channel UHJ, two decoding equations are provided in the original paper.
The alternative one is most often referenced for 2-channel UHJ decoding, but
the original/general one can also be used by assuming T is fully attenuated
(which the format allows for, as T can be variably attenuated by a factor
between 0 and 1 to deal with an imperfect transmission medium).

Neither method can be perfect for 2-channel UHJ, it's irrevocably lossy to the
original source, but my subjective testing indicates the general equation
produces less audibly errant results.

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