[opus] OPUS_SET_WAVEFORM_MATCHING() and Ambisonics

[Jean-Marc Valin]

Hi,

I'm attaching a patch that implements a new OPUS_SET_WAVEFORM_MATCHING()
ctl that attempts to better match the waveform (and preserve the phase),
even at the cost of worse quality on "regular" mono/stereo files. The
setting can be used by ambisonics family 2 (second patch) to avoid
artifacts caused by phase errors (which matters a lot more for
ambisonics). Since I don't have an ambisonics setup, I'd be interested
in review/testing before I merge that. If you have such a setup, please
report any improvement/regression.

Cheers,

	Jean-Marc
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