- remove the old LGPL license headers from all files in Spack
- add SPDX headers to all files
- core and most packages are (Apache-2.0 OR MIT)
- a very small number of remaining packages are LGPL-2.1-only
* Initial add of flac
* Initial add of id3lib
* Initial add of the opus codec
* Initial add of sox audio processing tools
* Cleanup spec files to be inline with current standard
* Fix pep8 compliance
* Remove un-needed configuration
