An embedded CUE sheet must always point to the song file it is
contained in.

This finally enables the new embedded CUE sheet code: when a song file
contains a playlist, it is printed in the "lsinfo" output, so clients
get to know about this.

Use _scan() instead, to have more control.

Parses CUE data from the "CUESHEET" tag.  Needs further integration in
the update thread.

Prepare for big CUESHEET tags.

The new method pair() receives an arbitrary name/value pair.  Support
for this is being added to a few decoder plugins.

Remove clutter from wavpack_scan_file(), and use a (large) fixed
buffer for the tag item.

Fixes build regression.

Pass a callback table to scan_file() and scan_stream(), instead of
returning a tag object.

When gme_track_info() returns with success, then the gme_info_t
pointer must be set.

All supported ffmpeg/libav versions have this.

The only other libFLAC call (seek) does not produce fatal errors.

Call it in the function that also invokved
FLAC__stream_decoder_init_*().

https://www.xkcd.com/292/

The struct is smaller because it is sparse.  Its traversal is also
more efficient.

To replace libcue, the unmaintained and crashy library.

Conflicts:
	NEWS
	configure.ac