Refactors the pipeline command generation logic from audio.py into a new module, and adds unit tests. #441
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This also deletes the already-commented-out code that would have supported
gstreamer. We should just remove gstreamer from the set of recognized backends.
This reduces a lot of code duplication about how the pipeline commands were
generated, and makes them drastically easier to update and the validate. It
also highlighted a number of surprising discrepancies which should be
investigated.
Makes significant progress on #434, and is close to avoiding any import-time
work from audio.py, which is relevant to #425.