Follow symlinks for music folder scan. Fixes #1953
Merge pull request #1959 from basilfx/symlinkScan

Follow symlinks for library scan.
Merge remote-tracking branch 'upstream/develop' into feature/refactor_config
Auto cue split

- Attempt to split audio files by cue sheet during post processing,
requires shntools with flac or xld. If the split fails then the
directory is set as unprocessed.
https://github.com/rembo10/headphones/issues/1938

- last.fm album art/info - try with release id if adding album
manually. https://github.com/rembo10/headphones/issues/1923,
https://github.com/rembo10/headphones/issues/1871
Fix extras form data; change bool cast to int(bool( cast for some data
Rename headphones.CFG to headphones CONFIG
Merge remote-tracking branch 'upstream/develop' into feature/refactor_config

Conflicts:
	headphones/postprocessor.py