Some FLAC audio files would crash due if flac metadata was enabled. This commit addresses that issue by using libFLAC to parse the tags/pictures instead of dr_flac. dr_flac is still used to read the samples since the API is much simpler for that.
- Settings to toggle metadata for FLAC/MP3 (sometimes loading the cover images can take a while - which is the reason for introducing this feature).
- Sort alphabetically in ascending/descending order and by smallest/largest file size.
- Also display the back button as long as the CWD is not the root path
