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WIP: Microphone class using Psychtoolbox audio (#3660)

* NF: Initial work on microphone support using PTB and backends.

* RFL Removed unused imports.

* MISC: Various changes.

* NF: Added AudioClip class for storing samples.

* NF: Added WAV and CSV export of audio clip data.

* NF: Added properties for determining if audio is mono or stereo.

* DOCS: Updated docs for multichannel recordings.

* RF: Moved audio manipulation to `audiotools` package.

* DOCS: Expanded documentation.

* RF: Reorganized microphone module. Added constants for audio quality.

* NF: Starting support for picking a microphone.

* RF: Moved audio device descriptors out of _microphone.py, some cleanups.

* NF: Check if ptb is installed, warn if not.

* RF: Moved around imports.

* NF: Added quality levels data for preferences.

* RF: Use setters in __init__

* DOCS: Added documentation for AudioDevice class.

* NF: Added functions to generate tones and silence.

* DOCS/NF: Added more documentation and exceptions.

* DOCS: More docs about using the AudioDevice class.

* NF/EN: Added support for loading and saving audio clips using `soundfile`. Added method to calculate RMS from samples along each channel.

* FF: Forgot to add new constants to __all__

* FF: Wrong function for sawtooth

* FF: Wrong function for sawtooth in audiotools too. Fixed.

* NF: Added append function.

* NF: Added voice quality option.

* NF: Added white noise generation.

* NF: Added user data property, some more constants.

* RF: Removed audioClip field.

* NF: Added audio status descriptor.

* NF: Audio device status property.

* DOCS: AudioDeviceStatus documentation.

* DOCS: AudioDeviceStatus documentation to properties too.

* NF: Added __repr__ method to audio status descriptor.

* RF: Renamed `AudioDevice` to `AudioDeviceInfo` and added `__repr__` method to it.

* RF: Lots of changes.

* FF: Use clip instead of scaling.

* ... (continued)

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