revised Stream:resample() - it takes a stream factor now, so you can control playpack speed

* The old implementation was simple but severely limited:
  * the resample factor (playback speed) could only be scalar
  * for infinite source streams, the algorithm would require infinitely growing memory.
    The algorithm therefore also wasn't realtime-safe and quite slow (probably because of reallocations).
* This could be made to work with stream-factors if the source stream is infinite,
  but we couldn't get rid of the memory requirements due to being based on IndexStream.
* Instead, there is a custom ResampleStream now that backs Stream:resample().
  It also performs linear interpolation but has constant memory requirements and works with factor-streams.
  Even for finite source streams and constant factors this implementation will be faster and more
  real-time safe.
* You cannot play backwards, due to missing buffering.
  This can still be done manually using IndexStream if necessary.

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