configure.ac: prepare for 0.18.13
Win32Main: move to win32/
Makefile.am: fix dependencies for win32

It happened to me when doing the Haiku port, src/mpd failed to
be relinked properly when editing source files, and likely also
happens on win32, although I didn't try this change.

When building for windows, src_mpd_DEPENDENCIES is overriden.

Automake then disables the default version which contains all
the static libraries. In Makefile.in:
@HAVE_WINDOWS_FALSE@src_mpd_DEPENDENCIES = libmpd.a \

Instead we use EXTRA_src_mpd_DEPENDENCIES which is meant for this.
event/BufferedSocket: fix inversed buffer check

This was broken by commit 84d20d9e, which deleted the "!" from the
check.
AllCommands: close connection after syntax error

Stop HTTP clients from exploiting MPD via forged POST requests.
MusicChunk: update API documentation
MusicChunk: rename struct to MusicChunk
Filter: update API documentation
PcmConvert: Convert() returns ConstBuffer
Filter: FilterPCM() returns ConstBuffer

API simplification.  We can now avoid abusing a "size_t*" as
additional return value.
Merge branch 'v0.18.x'
test/test_pcm: add PcmExport unit test
PcmExport: use class ConstBuffer
PcmDsdUsb: use class ConstBuffer
Merge branch 'master' of git://git.musicpd.org/master/mpd