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[Sc-devel] Added machine-listening UGens: SpecCentroid, SpecFlatness, SpecPcile

Hi all -

Partly connected with offlist discussions with Nick, I've now (rev
6827) added three more UGens to the MachineListening target:
SpecCentroid, SpecFlatness, SpecPcile. They're essentially the same as
the FFTCentroid, FFTFlatness, FFTPercentile from my plugin pack.

Briefly: SpecCentroid correlates with perceived brightness,
SpecFlatness correlates with perceived noisiness, SpecPcile estimates
the sonic equivalent of filter cutoff positions (the "rolloff point").

Along with the other recent ML UGens, I'd say this now means that SC
has pretty much the complete set of acoustic measures that are
well-supported by perceptual/timbral research, which is nice. The more
"cutting-edge" stuff that is less common will stay in the external
plugin packs of course, but the ones Nick and I have added have a lot
of research literature behind them.