Use a split filter for the FIR-based UHJ encoders

This applies the all-pass filter in two steps, first as a relatively short
time-domain FIR filter, then as a series of frequency domain convolutions
(using complex multiplies). Time-domain convolution scales poorly, so larger
convolutions benefit from being done in the frequency domain (though the first
part is still done in the time domain, to avoid longer delays).

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