Allow code sharing.

The new function playlist_open_any() combines playlist_mapper_open(),
playlist_list_open_uri() and playlist_list_open_stream(), providing an
easy API for all of them.

This fixes test/run_output.

Allow code sharing.

Supports a number of videogame music formats, more info here:
http://www.fly.net/~ant/libs/audio.html

I wrote this plugin for the latest svn, get it here:
http://code.google.com/p/game-music-emu/source/checkout

Fix distcheck.

Apply the replay gain in the output thread.  This means a new setting
will be active instantly, without going through the whole music pipe.
And we might have different replay gain settings for each audio output
device.

Needed for the fluidsynth decoder plugin.

Ensure that the pcm_convert() length argument is aligned to the sample
size.

This playlist plugin handles FLAC files with embedded CUE sheets.

Don't limit the "rewind" input plugin to CURL streams.

Make it X_decoder_plugin.c.

The replay_gain_state struct holds the precalculated scale factor,
which is removed from struct replay_gain_info.

Don't add these to the global MPD_CFLAGS and MPD_LIBS.  This allows
test programs to link without libopenal.

This replaces the rewinding buffer code from the CURL input plugin.
It is more generic, and allows rewinding even when the server sends
Icy-Metadata (which would have been too difficult to implement within
the CURL plugin).

This is a rather complex patch for the stable branch (v0.15.x), but it
fixes a serious problem: the "vorbis" decoder plugin was unable to
play streams with Icy-Metadata, because it couldn't rewind the stream
after detecting the codec (Vorbis vs. FLAC).

Use the plugin instead of the glue code in normalize.c.  This is used
wrapped inside a "autoconv" filter, to enable normalization for all
input file formats.

This plugin is the groundwork for MPD's future generic CUE sheet
support.  That's not complete yet, e.g. there is no way for a playlist
plugin to address an arbitrary position within a music file.

Make archive_file a "real" struct, extended by all plugins.  Add the
plugin pointer to it.  Wrap all method calls in functions.

Moved the archive plugin "extern" declarations into each plugin
header.

Based on libiso9660.

For the fluidsynth plugin.

This plugin is based on libzzip.