Named waveform buffers

[Woyten]

Access waveform buffers by a custom name and not by index

Ideas

• The Stage object continues to access waveform buffers by index
• The StageSpec object uses named buffers that need to me mapped to an index
• Use an automatically determined number of waveform buffers. The buffers are waveform-local.
• Possible extension: Use global buffers to process AudioIn or AudioOut as a whole