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This replaces the original virtual surround sink with a total rewrite, aiming to implement any number of hrir use cases, including asymmetrical impulses as two separate left and right output files. It uses FFTW3 FFT convolution, using the overlap- save method, with full rewind support. It operates in steps equal to the resampled length of the hrir, and overlaps input blocks in increments equal to the size of the FFT block. If using paired hrirs, it requires matched sample spec and sample rates and channel maps. For best results, the input files should have speaker maps, rather than expecting the sample loader to auto detect the mapping. Part-of: <pulseaudio/pulseaudio!240>
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