modules: add SoX Resampler audio_filter
This resampler supports 5 quality presets: from 0 to 4, 2 is the default and correspond to "mq". It supports integer and float samples. Performances are way better when this module is used as an "audio converter" (fixed sample rate). See http://lastique.github.io/src_test/ for comparison with speexdsp. It is deactivated for now.
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