- Added `input_format`/`output_format` options to both input and output
audio streams.
- Replaced the previous (confusing) occurrences of `ffmpeg_format` and
`format`.
- Added custom `dtype` option for `sound.play`.
- Added `join` flag (default: false) to `sound.play` to wait for the
playback to finish.
Different versions of the `sounddevice` dependency may or may not return
the `index` parameter when querying the available sound devices.
Thus, the code should be ready for both cases.
Fabio Manganiello