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This PR reworks the
AudioData.get_value()backend to lazily fetch/resample data.Before that, the hwole value of each AudioItem was fetched before being downsampled.
Now, the AudioItem data is streamed (seamlessly across items) and resampled on the go, so that the RAM usage is optimized.
I kinda tweeked the stream process in the MSEED backend, as obspy doesn't seem to provide streaming methods. All the old test cases pass, so I guess I didn't break anything!