Make sure the queue "owns" all song objects, so nobody else can free
them.

Make sure the player "owns" the next_song object, so nobody else can
free it.

Make sure the decoder "owns" the song object, so nobody else can free
it.

Initial support for "detached" songs that come from the database, but
are private copies.

decoder_is_current_song() now recognizes different instances of the
same physical song.

Optimize the ProxyDatabase by invoking "stats" on the peer, instead of
visiting all songs.

Optimize the ProxyDatabase by invoking "list" on the peer, instead of
visiting all songs.

Let the C++ compiler take care for freeing the objects safely.

Conflicts:
	src/player_thread.c

Just in case "song" becomes invalid at some point.

Replaces _current_song().

Fixes crash.

Replaces the old global "soundfont" which never worked.

Now that the libfluidsynth API was sanitized, we can enable the plugin
automatically if libfluidsynth is installed.

Use libfluidsynth's new function fluid_player_get_status().

The libfluidsynth now accepts const strings.

Use fluid_is_midifile() to verify the file format.

The libfluidsynth API is now sane, and does not require real-time
decoding.

Don't free the string right after calling log_init_file().  Add a new
function log_deinit() that frees the string on shutdown.

This fixes cycling the log file after SIGHUP (Mantis ticket 0003524).

Eliminate the g_usleep() call.

Reduce command latency while paused.

One large loop and only one pa_stream_get_state() call.

Reset the timer when paused and no client is connected.

This fixes Mantis ticket 0003527.

This is part of libavutil.