- Improved precision with `aws_live` transcription.
- Discard `sounddevice` by `pyAudio` to capture the audio stream.
- Adjusted recording params (`MAX_LOW_AUDIO_FLAG`, `AUDIO_MIN_RMS` etc.).
- Visualized recording volume.
- Modified shell input arg parser, enabled subcommand and parameter selection with mutual constraints.
- Enabled multiple target and input language selection, now supporting English, Chinese, French, German, Japanese, Korean, Russian and Spanish.
- Purified code.