Maybe this was once a required kludge for Windows, but it's not
anymore.

Fixes hanging playback with soxr resampler.

Closes #139, #141

Tremor decoder is unusable since commit 2ee43c40. Sound is distorted to
the point where it's nothing but noise.

The data from vorbis_synthesis_pcmout() needs to be scaled and
clipped for 16 bit sample size. For reference see
http://lists.xiph.org/pipermail/tremor/2010-April/001642.html and
http://lists.xiph.org/pipermail/vorbis/2006-October/026513.html.
Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>

Fixes the non-Linux build.

This loop was introduced in commit
24c1f463, but -EPIPE is not a possible
error condition for snd_pcm_hw_params().  This code does not appear to
make sense.  Problems with a wrong period_time should be caught before
that by snd_pcm_hw_params_set_period_time_near().

This commit removes the last "goto" in MPD!  Yay!

It's not possible to set CURL options after curl_easy_perform(), and
thus the CURLOPT_RANGE had no effect.

From the CURLOPT_RANGE documentation: "The application does not have
to keep the string around after setting this option."

Apparently, connecting a socket to a loopback address can block on
Windows, and a non-blocking socket will return WSAEINPROGRESS.  This
broken PoorSocketPair() in commit 2119e4fd, which made the socket
non-blocking right from the start.  This fix postpones the
ioctlsocket(FIONBIO) call until after the connect().

Closes #134

release v0.20.11

Turns out that using CP_ACP is a lousy idea, because only very few
Unicode characters can be represented by it.  Instead, switch to UTF-8
(which every sane person on other operating system already uses).

Closes #102

Applies the improvements from the previous commit to the "seek"
commands, which are also capable of switching songs.

Closes #119