Don't use libc's rand() function, because it is slow.  Our own trivial
linear congruential generator is good enough for dithering.

It's been superseded by GLib's GSList.

Nobody is using the signal_check library anymore.

This patch also removes the SIGUSR1 handler.

We are going to migrate away from the concept of notifying the main
thread.  There should be events sent to it instead.  This patch starts
a series to implement that.

Other libraries may need to access the main_loop reference, to add or
remove events, or to call g_main_loop_quit().

This is a rather huge patch, which unfortunately cannot be splitted.

Instead of using our custom ioops.h library, convert everything to use
the GLib main loop.

Moved implementation specific code to their own sources, internal
declarations in zeroconf-internal.h.

Only include headers which are really needed.  os_compat.h aimed to
make MPD easily portable, but was never actually made portable.

When there are no archive plugins, we do not need the archive API at
all.  Drop all its overhead.

Added missing includes.

No CamelCase file names.

input_curl.h was missing in the tarball because it was not listed in
$(mpd_headers).

MPD used to have a copy of the mp4ff library.  Since that has been
removed, AAC suport was disabled when there was no libmp4ff.  Separate
the libmp4ff test, and enable AAC support no matter if libmp4ff is
available.

Cleaning up artifacts from a merge gone wrong.  Also remove the
ringbuf library, which is not being used.

No CamelCase in the file name.  The output_buffer struct is going to
be renamed to music_pipe.  There are so many buffer levels in MPD, and
calling this one "output buffer" is wrong, because it's not the last
buffer before the music reaches the output devices.

Removed duplicated code.

The "simple singly-linked-list" library has been replaced with GLib's
GList and GQueue.

Don't compile the sources of disabled output plugins at all.

Renamed inputStream.c and inputStream_file.c.

MPD's HTTP client code has always been broken, no matter how effort
was put into fixing it.  Replace it with libcurl, which is known to be
quite stable.  This adds a fat library dependency, but only for people
who need streaming.

Again, no CamelCase in the directory name.

These plugins are not input plugins, they are decoder plugins.  No
CamelCase in the directory name.

MPD shouldn't integrate sources of other libraries.  Since libmp4ff is
part of libfaad, we should remove the old copy from src/mp4ff and link
with the current version from libfaad instead.

Separate code from pcm_utils.c to keep it small and simple.

Separate the resampling code from the rest of pcm_utils.c.  Create two
sub-libraries: pcm_resample_libsamplerate.c and
pcm_resample_fallback.c.

Copied and adapted code from the mp3 decoder plugin.  This library now
replaces the old and low-quality function pcm_convert_24_to_16().

No CamelCase in file names.

[mk: fixed indent, changed copyright statement, added autoconf test,
fixed includes paths, fixed 2 gcc warnings, don't close input stream
twice]

Don't compile the sources of disabled decoder plugins at all, and
don't attempt to register these.

If a feature is disabled, don't compile the source file at all,
disable it completely in Makefile.am instead.

Detect the following libraries with pkg-config: libshout, libid3tag,
libmad.

The switch from ogg.m4 to pkg-config intentionally disabled
libvorbisenc.  Enable it when shout_ogg is used.