Updates to python scripts (pyaudio3dtools rendering)

As mentioned in MR !38 (merged)

After the migration to git, the pyaudio3dtools scripts were not fully functional due to some missing dependencies.

This commit contains a number of updates and restores the scripts to working condition, listed below:

• 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

If there are no objections, I will merge this back to main by EOD 2022.07.15