Updates the WIN32 version number for the upcoming 0.18 release.

Auto-recover from soft errors.

Allow the plugin to allocate the GetSong() return value.

Fixes wrong object URIs with duplicate base names.

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.