[cleanup] restructure item generation scripts and remove duplication of directory tree
[cleanup] move item generation scripts into subfolder generation; see notes below
- created __init__.pyand__main__.pyfor generation module !! now usepython -m ivas_processing_scripts.generation!!
- moved reverb.pywrapper to main wrappers folder
- moved modified config.pytogeneration/config.py
- moved modified constants.pytogeneration/constants.py
- moved process_{ism,stereo}_itemstogeneration/
- integrated modifications to audiotools.audiofile.py