Deew

- update `pyproject.toml` and `poetry.lock`

- added ac4 to format error message
- fixed `allowed_bitrates` in `ac4_20`

- added AC4 immersive stereo support by MartinEesmaa
- add `dee_audio_filter_ac4_ims.dll` and `Object_0000.exe` from the AC4
zip to your DEE installation path and add `ac4_2_0 = 320` under the
`[default_bitrates]` section in your config file.
- mono input for TrueHD encoding error handling
- FLAC recommendation prompt for lossless mono/stereo encoding

- remove `-map 0:a:index` from `ffmpeg_args` if `-filter_complex` is present
somewhere in the command, so new ffmpeg versions can be used

- allow new python version to be used

- fixed spaces in paths
(`quote` parameter was not working in `wpc()` if `is_wsl` was false)