The server_socket library (used by the httpd output plugin) didn't
check for WIN32, that's fixed now.

Pass audio_output objects around instead of void pointers.  This will
give some more control to the plugin, and prepares for non-blocking
audio outputs.

Work around automake warning.

Move the "extern" declarations from output_list.c, for more type
safety.

Use it in handle_lsinfo(), and eliminate some duplicate code.

Use this struct for db_walk().

Reduce header dependencies.

First draft, not really pluggable currently - hard-coded to use the
"simple" plugin, and calls several of its internal functions.

The API is very simple currently, all searches are still performed
over the root "directory" object.  Future changes to the API will move
those search implementations into the plugin, to allow more efficient
implementations, or implementations that don't have the whole tree in
memory all the time.

libOggFLAC has been deprecated for 5 years now, and we havn't been
testing it for a long time.  Let's delete it.

Don't add those to MPD_CFLAGS / MPD_LIBS.

Make the code portable.

.. and destruct the output object properly in test/run_output.

Restore some of the original file structure from from raop_play.

Clean up the process before exiting.

Auto-enable the plugin when OpenSSL was found.

To demonstrate the new I/O thread.  libsoup is well-integrated into
the GLib main loop, which made this plugin pretty easy to write.

As a side effect, we have to initialize the I/O thread in all debug
programs that use the input API.

Try to eliminate the remaining blocking I/O.

Sorts remaining songs by priority.  This can be used for the
much-demanded "queue feature".

Remote Audio Output Protocol (RAOP), for Apple devices.

A bit of automake magic (see info automake "Per-Object Flags").
Compile-tested.