updates to python scripts from internal development repo

* LFE in binaural rendering updated
* Removed the dependency on the prerenderer for certain formats
* MC to MC conversions now use the same tables as IVAS
* Allow specifying ISM metadata files on the commandline (`-m` / `--metadata`)
* EFAP python implementation in `pyaudio3dtools/EFAP.py`
* ALLRAD python implementation added to `hoadecoder.py`, .mat files removed
* Restructuring of `spatialaudioconvert()` to be cleaner and more modular
* Improved support of metadata (mixed-scene) text file input